filter -> test in the tests section (i feel so embarrassed).

--HG--
branch : trunk
diff --git a/docs/api.rst b/docs/api.rst
index d7ed844..41949c8 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -528,13 +528,13 @@
 Custom Tests
 ------------
 
-Tests work like filters just that there is no way for a filter to get access
+Tests work like filters just that there is no way for a test to get access
 to the environment or context and that they can't be chained.  The return
-value of a filter should be `True` or `False`.  The purpose of a filter is to
+value of a test should be `True` or `False`.  The purpose of a test is to
 give the template designers the possibility to perform type and conformability
 checks.
 
-Here a simple filter that checks if a variable is a prime number::
+Here a simple test that checks if a variable is a prime number::
 
     import math