diff --git a/ChangeLog b/ChangeLog
index 30cfd317e8..afea301372 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-12-12  Martin Nordholts  <martinn@svn.gnome.org>
+
+	* app/core/gimptagged.c (gimp_tagged_get_identifier): Clarify
+	documentation.
+
 2008-12-11  Martin Nordholts  <martinn@svn.gnome.org>
 
 	Bug 555954 – Merge Tagging of Gimp Resources GSoC Project
diff --git a/app/core/gimptagged.c b/app/core/gimptagged.c
index 496bbcddea..bf31260713 100644
--- a/app/core/gimptagged.c
+++ b/app/core/gimptagged.c
@@ -161,7 +161,9 @@ gimp_tagged_get_tags (GimpTagged *tagged)
  * Returns an identifier string which uniquely identifies the tagged
  * object. Two different objects must have unique identifiers but may
  * have the same checksum (which will be the case if one object is a
- * copy of the other).
+ * copy of the other). The identifier must be the same across
+ * sessions, so for example an instance pointer cannot be used as an
+ * identifier.
  *
  * Return value: a newly allocated string containing unique identifier
  * of the object. It must be freed using #g_free.