diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 8567d6227c..dd7032aaab 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -269,16 +269,16 @@ assert_equal({expected}, {actual} [, {msg}])                    *assert_equal()*
                 Return: ~
                   (`0|1`)
 
-assert_equalfile({fname-one}, {fname-two})                  *assert_equalfile()*
-		When the files {fname-one} and {fname-two} do not contain
+assert_equalfile({fname_one}, {fname_two})                  *assert_equalfile()*
+		When the files {fname_one} and {fname_two} do not contain
 		exactly the same text an error message is added to |v:errors|.
 		Also see |assert-return|.
-		When {fname-one} or {fname-two} does not exist the error will
+		When {fname_one} or {fname_two} does not exist the error will
 		mention that.
 
                 Parameters: ~
-                  • {fname-one} (`string`)
-                  • {fname-two} (`string`)
+                  • {fname_one} (`string`)
+                  • {fname_two} (`string`)
 
                 Return: ~
                   (`0|1`)
diff --git a/runtime/lua/vim/_meta/vimfn.lua b/runtime/lua/vim/_meta/vimfn.lua
index f40a94a442..bde3101479 100644
--- a/runtime/lua/vim/_meta/vimfn.lua
+++ b/runtime/lua/vim/_meta/vimfn.lua
@@ -221,16 +221,16 @@ function vim.fn.assert_beeps(cmd) end
 --- @return 0|1
 function vim.fn.assert_equal(expected, actual, msg) end
 
---- When the files {fname-one} and {fname-two} do not contain
+--- When the files {fname_one} and {fname_two} do not contain
 --- exactly the same text an error message is added to |v:errors|.
 --- Also see |assert-return|.
---- When {fname-one} or {fname-two} does not exist the error will
+--- When {fname_one} or {fname_two} does not exist the error will
 --- mention that.
 ---
---- @param fname-one string
---- @param fname-two string
+--- @param fname_one string
+--- @param fname_two string
 --- @return 0|1
-function vim.fn.assert_equalfile(fname-one, fname-two) end
+function vim.fn.assert_equalfile(fname_one, fname_two) end
 
 --- When v:exception does not contain the string {error} an error
 --- message is added to |v:errors|.  Also see |assert-return|.
diff --git a/src/nvim/eval.lua b/src/nvim/eval.lua
index d60e9bd290..69f36796b9 100644
--- a/src/nvim/eval.lua
+++ b/src/nvim/eval.lua
@@ -326,17 +326,17 @@ M.funcs = {
     args = { 2, 3 },
     base = 1,
     desc = [=[
-      When the files {fname-one} and {fname-two} do not contain
+      When the files {fname_one} and {fname_two} do not contain
       exactly the same text an error message is added to |v:errors|.
       Also see |assert-return|.
-      When {fname-one} or {fname-two} does not exist the error will
+      When {fname_one} or {fname_two} does not exist the error will
       mention that.
 
     ]=],
     name = 'assert_equalfile',
-    params = { { 'fname-one', 'string' }, { 'fname-two', 'string' } },
+    params = { { 'fname_one', 'string' }, { 'fname_two', 'string' } },
     returns = '0|1',
-    signature = 'assert_equalfile({fname-one}, {fname-two})',
+    signature = 'assert_equalfile({fname_one}, {fname_two})',
   },
   assert_exception = {
     args = { 1, 2 },