diff --git a/tests/caps.py b/tests/caps.py
index 439c434..14d616f 100644
--- a/tests/caps.py
+++ b/tests/caps.py
@@ -117,7 +117,7 @@
 
 class FillTableExact(basic.SimpleProtocol):
     """
-    Fill the flow table with exact matches
+    Fill the flow table with exact matches; can take a while
 
     Fill table until no more flows can be added.  Report result.
     Increment the source IP address.  Assume the flow table will