--- Coro/Changes	2011/04/30 05:17:42	1.557
+++ Coro/Changes	2011/05/06 18:01:13	1.558
@@ -4,6 +4,8 @@
 TODO: channel->maxsize(newsize)?
 TODO: http://www.microsoft.com/msj/archive/s2ce.aspx
 
+        - croak when a coro being cancelled tries to block (e.g. while executing
+          a guard block).
 	- implement Coro->cancel in XS for a 20% speed improvement, and to
           be able to implement mutual cancellation.
         - cancelling a coro while it itself is cancelling another coro is