[PATCH v3 4/4] api-builtin.txt: explain common command groups

["Sébastien Guimmara" <sebastien.guimmara@gmail.com>]

Update api-builtin.txt to explain how to add the group information
for common commands.

Signed-off-by: Sébastien Guimmara <sebastien.guimmara@gmail.com>
---
  Documentation/technical/api-builtin.txt | 6 +++++-
  1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/technical/api-builtin.txt b/Documentation/technical/api-builtin.txt
index 22a39b9..76baba8 100644
--- a/Documentation/technical/api-builtin.txt
+++ b/Documentation/technical/api-builtin.txt
@@ -50,7 +50,11 @@ Additionally, if `foo` is a new command, there are 3 more things to do:
  
  . Write documentation in `Documentation/git-foo.txt`.
  
-. Add an entry for `git-foo` to `command-list.txt`.
+. Add an entry for `git-foo` to `command-list.txt`. If foo is considered
+  a 'common' command, add 'common-x_group' as the third value,
+  where x_group is one of the existing themes:
+
+	git-foo        mainporcelain common-3_worktree
  
  . Add an entry for `/git-foo` to `.gitignore`.
  
-- 
2.4.0