Start release notes for 2.15.12

Change-Id: Ib3c51c7b46f3bd23f683a4e5d32d2c2cc3ecc172
diff --git a/pages/site/releases/2.15.md b/pages/site/releases/2.15.md
index ba76e16..caafb39 100644
--- a/pages/site/releases/2.15.md
+++ b/pages/site/releases/2.15.md
@@ -405,6 +405,12 @@
 
 ## Bugfix Releases
 
+### 2.15.12
+
+* [Issue 10531](https://bugs.chromium.org/p/gerrit/issues/detail?id=10531):
+Fix LocalUsernamesToLowerCase program.
+
+
 ### 2.15.11
 
 * [Issue 10106](https://bugs.chromium.org/p/gerrit/issues/detail?id=10106):