diff --git a/docs/intro.rst b/docs/intro.rst
index a7187a27..85fde71a 100644
--- a/docs/intro.rst
+++ b/docs/intro.rst
@@ -295,6 +295,8 @@ This is the current list of error and warning codes:
 +------------+----------------------------------------------------------------------+
 | E251       | unexpected spaces around keyword / parameter equals                  |
 +------------+----------------------------------------------------------------------+
+| E252       | missing whitespace around parameter equals                          |
++------------+----------------------------------------------------------------------+
 +------------+----------------------------------------------------------------------+
 | E261       | at least two spaces before inline comment                            |
 +------------+----------------------------------------------------------------------+