diff --git a/Documentation/technical/api-builtin.txt b/Documentation/technical/api-builtin.txt
index 5cb2b0590abb1fc4e4685097ba3cdd3d0683a95f..b0cafe87bee046dc9b2d4e61e0d057e787a6f1f6 100644
--- a/Documentation/technical/api-builtin.txt
+++ b/Documentation/technical/api-builtin.txt
@@ -49,6 +49,8 @@ Additionally, if `foo` is a new command, there are 3 more things to do:
 
 . Add an entry for `git-foo` to `command-list.txt`.
 
+. Add an entry for `/git-foo` to `.gitignore`.
+
 
 How a built-in is called
 ------------------------