--- a/utils.py	Wed Apr 08 11:29:24 2015 +0200
+++ b/utils.py	Mon Mar 09 10:49:03 2015 +0100
@@ -646,7 +646,7 @@
 
     Occasional elements can be buggy requests (server-side) or
     end-user (web-ui provided) requests. These have to be cleaned up
-    when they fill the cache, without evicting the usefull, frequently
+    when they fill the cache, without evicting the useful, frequently
     used entries.
     """
     # quite arbitrary, but we want to never