diff --git a/pyfec/fec/util/mathutil.py b/pyfec/fec/util/mathutil.py
index de95a6a8e..ea8312d95 100644
--- a/pyfec/fec/util/mathutil.py
+++ b/pyfec/fec/util/mathutil.py
@@ -75,7 +75,7 @@ def permute(l):
     Return all possible permutations of l.
 
     @type l: sequence
-    @rtype a set of sequences
+    @rtype: a list of sequences
     """
     if len(l) == 1:
         return [l,]