diff --git a/docs/source/error_code_list.rst b/docs/source/error_code_list.rst
index 1a39bf8feb6c..efafb4d01f96 100644
--- a/docs/source/error_code_list.rst
+++ b/docs/source/error_code_list.rst
@@ -89,6 +89,23 @@ This example accidentally calls ``sort()`` instead of :py:func:`sorted`:
 
     x = sort([3, 2, 4])  # Error: Name "sort" is not defined  [name-defined]
 
+
+Check that a variable is not used before it's defined [used-before-def]
+-----------------------------------------------------------------------
+
+Mypy will generate an error if a name is used before it's defined.
+While the name-defined check will catch issues with names that are undefined,
+it will not flag if a variable is used and then defined later in the scope.
+used-before-def check will catch such cases.
+
+Example:
+
+.. code-block:: python
+
+    print(x)  # Error: Name "x" is used before definition [used-before-def]
+    x = 123
+
+
 Check arguments in calls [call-arg]
 -----------------------------------