diff --git a/doc/TODO.012 b/doc/TODO.012
index 44b37aa31..cf92fb866 100644
--- a/doc/TODO.012
+++ b/doc/TODO.012
@@ -19,3 +19,5 @@ Backport for 0.1.2.x once better tested:
   o r11915: just because you hup, don't publish a near-duplicate descriptor
   - r11994: Call routerlist_remove_old_routers() less.  This will be a
 	    tricky backport.
+  - r12153 and r12154: Give better warnings when we fail to mmap a descriptor
+            store that we just wrote.
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