diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index 460b2f32a73..13fa5e69aa1 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -785,7 +785,7 @@ Test cases
       .. versionadded:: 2.7
 
 
-   .. method:: assertRegexpMatches(text, regexp[, msg=None]):
+   .. method:: assertRegexpMatches(text, regexp, msg=None)
 
       Verifies that a *regexp* search matches *text*.  Fails with an error
       message including the pattern and the *text*.  *regexp* may be