diff --git a/src/todo.txt b/src/todo.txt
index 908e2d1..67bee9f 100644
--- a/src/todo.txt
+++ b/src/todo.txt
@@ -1,3 +1,4 @@
+- soph segfaults at no switch or -r4 (-r3 is okay??) using non-debug version.
 - Splice/AS does not work well because priority key search stumbles over the
   public key search stuff. That is a flaw in the heuristic: we should not look
   for anything that is in the intruder knowledge already. In fact, it is a