diff --git a/TODO b/TODO
index d11d41298f9e67260d9df282c6ec8c8458bb2a97..721603cd3fcc9eca51e59bfa68e5d3993a414406 100644
--- a/TODO
+++ b/TODO
@@ -3,6 +3,8 @@ server.
 
 * Showstoppers
 
+** lookup_regexp is ridiculously slow.
+
 * High priority, but they can wait until after the next release.
 
 ** Features