add warning note to isKnown() per r111017

diff --git a/includes/Title.php b/includes/Title.php
index bd1851c..f72a5ea 100644 (file)
--- a/includes/Title.php
+++ b/includes/Title.php
@@ -4180,6 +4180,9 @@ class Title {
         * viewed?  In particular, this function may be used to determine if
         * links to the title should be rendered as "bluelinks" (as opposed to
         * "redlinks" to non-existent pages).
+        * Adding something else to this function will cause inconsistency
+        * since LinkHolderArray calls isAlwaysKnown() and does its own
+        * page existence check.
         *
         * @return Bool
         */