diff --git a/.gitattributes b/.gitattributes
index e09a918303..1770c9b164 100755
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,6 +1,16 @@
-*.h linguist-language=C
+*.h.in          linguist-language=C
+*.c.in          linguist-language=C
+*CMakeLists.txt linguist-language=CMake
+
+runtime/doc/*   linguist-documentation
+
+src/xdiff/**    linguist-vendored
+src/cjson/**    linguist-vendored
+src/unicode/**  linguist-vendored
+
 src/nvim/testdir/test42.in diff
-.github/ export-ignore
+
+.github/    export-ignore
 .travis.yml export-ignore
 codecov.yml export-ignore
-.builds/ export-ignore
+.builds/    export-ignore