string-list: document that string_list_insert() inserts unique strings
Signed-off-by: Heiko Voigt <hvoigt@hvoigt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/technical/api-string-list.txt b/Documentation/technical/api-string-list.txt
index ce24eb9..5a0c14f 100644
--- a/Documentation/technical/api-string-list.txt
+++ b/Documentation/technical/api-string-list.txt
@@ -83,7 +83,9 @@
Insert a new element to the string_list. The returned pointer can be
handy if you want to write something to the `util` pointer of the
- string_list_item containing the just added string.
+ string_list_item containing the just added string. If the given
+ string already exists the insertion will be skipped and the
+ pointer to the existing item returned.
+
Since this function uses xrealloc() (which die()s if it fails) if the
list needs to grow, it is safe not to check the pointer. I.e. you may
