diff --git a/doc/md_docs.go b/doc/md_docs.go
index 79bb687..21b4823 100644
--- a/doc/md_docs.go
+++ b/doc/md_docs.go
@@ -111,7 +111,7 @@ func GenMarkdownTree(cmd *cobra.Command, dir string) {
 	GenMarkdownTreeCustom(cmd, dir, emptyStr, identity)
 }
 
-func GenMarkdownTreeCustom(cmd *cobra.Command, dir string, filePrepender func(string) string, linkHandler func(string) string) {
+func GenMarkdownTreeCustom(cmd *cobra.Command, dir string, filePrepender, linkHandler func(string) string) {
 	for _, c := range cmd.Commands() {
 		if !c.IsAvailableCommand() || c.IsHelpCommand() {
 			continue
diff --git a/doc/md_docs.md b/doc/md_docs.md
index 41259d2..8c6a00a 100644
--- a/doc/md_docs.md
+++ b/doc/md_docs.md
@@ -39,7 +39,7 @@ This will write the markdown doc for ONLY "cmd" into the out, buffer.
 Both `GenMarkdown` and `GenMarkdownTree` have alternate versions with callbacks to get some control of the output:
 
 ```go
-func GenMarkdownTreeCustom(cmd *Command, dir string, filePrepender func(string) string, linkHandler func(string) string) {
+func GenMarkdownTreeCustom(cmd *Command, dir string, filePrepender, linkHandler func(string) string) {
     //...
 }
 ```