--- a/src/pyams_utils/tales.py	Wed Jun 07 10:46:39 2017 +0200
+++ b/src/pyams_utils/tales.py	Mon Jun 19 14:03:54 2017 +0200
@@ -94,7 +94,7 @@
 class ExtensionExpr(ContextExprMixin, StringExpr):
     """extension: TALES expression
 
-    This expression can be used a call a custom named adapter providing ITALESExtension interface.
+    This expression can be used to call a custom named adapter providing ITALESExtension interface.
     """
 
     transform = Symbol(render_extension)