diff --git a/modeltranslation/utils.py b/modeltranslation/utils.py
index c671228..95ba9d1 100755
--- a/modeltranslation/utils.py
+++ b/modeltranslation/utils.py
@@ -95,6 +95,10 @@ def build_css_class(localized_fieldname, prefix=''):
 
 def unique(seq):
     """
+    Returns a generator yielding unique sequence members in order
+    
+    A set by itself will return unique values without any regard for order.
+    
     >>> list(unique([1, 2, 3, 2, 2, 4, 1]))
     [1, 2, 3, 4]
     """