add gitignore entry to description about how to write a builtin

If the author forgets the gitignore entry the built result will show up
as new file in the git working directory.

Signed-off-by: Heiko Voigt <hvoigt@hvoigt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/technical/api-builtin.txt b/Documentation/technical/api-builtin.txt
index 5cb2b05..b0cafe8 100644 (file)
--- 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
 ------------------------