diff --git a/pep-0636.rst b/pep-0636.rst
index eb8d62ebf..880074232 100644
--- a/pep-0636.rst
+++ b/pep-0636.rst
@@ -578,7 +578,7 @@ Several other key features:
 - Mapping patterns: ``{"bandwidth": b, "latency": l}`` captures the
   ``"bandwidth"`` and ``"latency"`` values from a dict.  Unlike sequence
   patterns, extra keys are ignored.  A wildcard ``**rest`` is also
-  supported.  (But ``**_`` would be redundant, so it not allowed.)
+  supported.  (But ``**_`` would be redundant, so it is not allowed.)
 
 - Subpatterns may be captured using the ``as`` keyword::