diff --git a/contributing/code/standards.rst b/contributing/code/standards.rst
index a2720e991df..764c15382f6 100644
--- a/contributing/code/standards.rst
+++ b/contributing/code/standards.rst
@@ -141,6 +141,8 @@ Naming Conventions
 
 * Don't forget to look at the more verbose :doc:`conventions` document for
   more subjective naming considerations.
+  
+* Caught exceptions should assigned to a variable named `$e`.
 
 .. _service-naming-conventions: