Doc clean: add See Also link

'git clean' is controlled by gitignore. Provide See Also link for it.

Use of core.excludesfile is implied.

Signed-off-by: Philip Oakley <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Philip Oakley

Documentation/git-clean.txt

@@ -63,6 +63,10 @@ OPTIONS
 	Remove only files ignored by git.  This may be useful to rebuild
 	everything from scratch, but keep manually created files.
 
+SEE ALSO
+--------
+linkgit:gitignore[5]
+
 GIT
 ---
 Part of the linkgit:git[1] suite