diff --git a/wiki/ReleaseNotes.wiki b/wiki/ReleaseNotes.wiki
index f75149c6..c981defe 100644
--- a/wiki/ReleaseNotes.wiki
+++ b/wiki/ReleaseNotes.wiki
@@ -21,7 +21,7 @@ The high-level changes since version 4.2 are:
  * fixed the following bugs:<br>75, 79, 82, 83, 85, 86, 92
 
 Known issues with 4.3
- * known issues will appear here
+ * CORE will segfault under Ubuntu 11.10 with Tcl/Tk 8.5.10. There is a known bug in the tk-8.5.10 package, the workaround is to uninstall it and install tk-8.5.11 from [http://www.ubuntuupdates.org/tk8.5 here]; see [http://code.google.com/p/coreemu/issues/detail?id=90 bug #90]
 
 
 = 4.2 =