foo.diff

diff --git a/docs/x509.rst b/docs/x509.rst
index 5f36a92..4730319 100644
--- a/docs/x509.rst
+++ b/docs/x509.rst
@@ -646,7 +646,7 @@ X.509 Extensions
         certificate. This attribute only has meaning if ``ca`` is true.
         If ``ca`` is true then a path length of None means there's no
         restriction on the number of subordinate CAs in the certificate chain.
-        If it is zero or greater then that number defines the maximum length.
+        If it is zero or greater, then that number defines the maximum length.
         For example, a ``path_length`` of 1 means the certificate can sign a
         subordinate CA, but the subordinate CA is not allowed to create
         subordinates with ``ca`` set to true.