diff --git a/src/nvim/buffer.c b/src/nvim/buffer.c
index 6fc08643af..e0aac141ac 100644
--- a/src/nvim/buffer.c
+++ b/src/nvim/buffer.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/edit.c b/src/nvim/edit.c
index 208e41946b..01b9981192 100644
--- a/src/nvim/edit.c
+++ b/src/nvim/edit.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index 9581b81456..a97f6ac570 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -4,7 +4,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/ex_cmds.c b/src/nvim/ex_cmds.c
index c4fffcda71..b232d3fe81 100644
--- a/src/nvim/ex_cmds.c
+++ b/src/nvim/ex_cmds.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/ex_cmds2.c b/src/nvim/ex_cmds2.c
index a632a3cce4..e2e3368d0f 100644
--- a/src/nvim/ex_cmds2.c
+++ b/src/nvim/ex_cmds2.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/ex_docmd.c b/src/nvim/ex_docmd.c
index 4d9f8b5769..720d97a883 100644
--- a/src/nvim/ex_docmd.c
+++ b/src/nvim/ex_docmd.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/ex_eval.c b/src/nvim/ex_eval.c
index bea1aecb58..773005e72b 100644
--- a/src/nvim/ex_eval.c
+++ b/src/nvim/ex_eval.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/ex_getln.c b/src/nvim/ex_getln.c
index cbaf15e38d..be98da7cfc 100644
--- a/src/nvim/ex_getln.c
+++ b/src/nvim/ex_getln.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/fileio.c b/src/nvim/fileio.c
index a7472b40e2..c07597df47 100644
--- a/src/nvim/fileio.c
+++ b/src/nvim/fileio.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/fold.c b/src/nvim/fold.c
index b52938075c..29921bc816 100644
--- a/src/nvim/fold.c
+++ b/src/nvim/fold.c
@@ -4,7 +4,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/getchar.c b/src/nvim/getchar.c
index b77a030158..3692fa27aa 100644
--- a/src/nvim/getchar.c
+++ b/src/nvim/getchar.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/hardcopy.c b/src/nvim/hardcopy.c
index 819015a85d..73febdd0e6 100644
--- a/src/nvim/hardcopy.c
+++ b/src/nvim/hardcopy.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/if_cscope.c b/src/nvim/if_cscope.c
index e5cbb58608..578ae5de1e 100644
--- a/src/nvim/if_cscope.c
+++ b/src/nvim/if_cscope.c
@@ -5,7 +5,7 @@
  * The basic idea/structure of cscope for Vim was borrowed from Nvi.  There
  * might be a few lines of code that look similar to what Nvi has.
  *
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 #include <stdbool.h>
 
diff --git a/src/nvim/main.c b/src/nvim/main.c
index 83fe32cccb..f49db5cd82 100644
--- a/src/nvim/main.c
+++ b/src/nvim/main.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 #define EXTERN
diff --git a/src/nvim/mark.c b/src/nvim/mark.c
index 0432ec5cef..ae394b4da6 100644
--- a/src/nvim/mark.c
+++ b/src/nvim/mark.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/mbyte.c b/src/nvim/mbyte.c
index 087d2e677c..cdf8eba5d3 100644
--- a/src/nvim/mbyte.c
+++ b/src/nvim/mbyte.c
@@ -4,7 +4,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 /*
  * mbyte.c: Code specifically for handling multi-byte characters.
diff --git a/src/nvim/memfile.c b/src/nvim/memfile.c
index b6a341d5e8..6e94d7392a 100644
--- a/src/nvim/memfile.c
+++ b/src/nvim/memfile.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /// An abstraction to handle blocks of memory which can be stored in a file.
diff --git a/src/nvim/memline.c b/src/nvim/memline.c
index 85f545f960..e822a58273 100644
--- a/src/nvim/memline.c
+++ b/src/nvim/memline.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /* for debugging */
diff --git a/src/nvim/menu.c b/src/nvim/menu.c
index 9857b8a778..3859ba5ec8 100644
--- a/src/nvim/menu.c
+++ b/src/nvim/menu.c
@@ -4,7 +4,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/message.c b/src/nvim/message.c
index 5f06506a31..341306c6ca 100644
--- a/src/nvim/message.c
+++ b/src/nvim/message.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/misc1.c b/src/nvim/misc1.c
index 5097255880..3cdb8f59c7 100644
--- a/src/nvim/misc1.c
+++ b/src/nvim/misc1.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/misc2.c b/src/nvim/misc2.c
index d9bc35470f..11cdd81b35 100644
--- a/src/nvim/misc2.c
+++ b/src/nvim/misc2.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/move.c b/src/nvim/move.c
index 3831004703..b44d3f2fd9 100644
--- a/src/nvim/move.c
+++ b/src/nvim/move.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 /*
  * move.c: Functions for moving the cursor and scrolling text.
diff --git a/src/nvim/normal.c b/src/nvim/normal.c
index 78df4ea7ea..6713ab7591 100644
--- a/src/nvim/normal.c
+++ b/src/nvim/normal.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 /*
  * normal.c:	Contains the main routine for processing characters in command
diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index 3fd2c0b773..6693ca23c8 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/option.c b/src/nvim/option.c
index cc4df28837..bb14cae627 100644
--- a/src/nvim/option.c
+++ b/src/nvim/option.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/os_unix.c b/src/nvim/os_unix.c
index 828ccd556d..ddb799f23d 100644
--- a/src/nvim/os_unix.c
+++ b/src/nvim/os_unix.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/quickfix.c b/src/nvim/quickfix.c
index 4d53238381..f3818ef639 100644
--- a/src/nvim/quickfix.c
+++ b/src/nvim/quickfix.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/screen.c b/src/nvim/screen.c
index 0c4cf30602..3c2c18ed32 100644
--- a/src/nvim/screen.c
+++ b/src/nvim/screen.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/search.c b/src/nvim/search.c
index fbe07b6fed..0e748dec6d 100644
--- a/src/nvim/search.c
+++ b/src/nvim/search.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 /*
  * search.c: code for normal mode searching commands
diff --git a/src/nvim/spell.c b/src/nvim/spell.c
index 7d9257141a..c228a450d6 100644
--- a/src/nvim/spell.c
+++ b/src/nvim/spell.c
@@ -2,7 +2,7 @@
 //
 // Do ":help uganda"  in Vim to read copying and usage conditions.
 // Do ":help credits" in Vim to see a list of people who contributed.
-// See README.txt for an overview of the Vim source code.
+// See README.md for an overview of the Vim source code.
 
 // spell.c: code for spell checking
 //
diff --git a/src/nvim/syntax.c b/src/nvim/syntax.c
index d0491ab42b..099bf1ca29 100644
--- a/src/nvim/syntax.c
+++ b/src/nvim/syntax.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/tag.c b/src/nvim/tag.c
index b0d1a17c89..96b6dbe51f 100644
--- a/src/nvim/tag.c
+++ b/src/nvim/tag.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/undo.c b/src/nvim/undo.c
index b0c49cbf8e..fe6070994f 100644
--- a/src/nvim/undo.c
+++ b/src/nvim/undo.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read copying and usage conditions.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 /*
diff --git a/src/nvim/window.c b/src/nvim/window.c
index b71b2cb603..206cefd484 100644
--- a/src/nvim/window.c
+++ b/src/nvim/window.c
@@ -3,7 +3,7 @@
  *
  * Do ":help uganda"  in Vim to read a list of people who contributed.
  * Do ":help credits" in Vim to see a list of people who contributed.
- * See README.txt for an overview of the Vim source code.
+ * See README.md for an overview of the Vim source code.
  */
 
 #include <errno.h>