Processes/coding-guidelines.md

@@ -149,7 +149,7 @@ A catch statement should have braces on a single line, like this:
      .
 ```
 
-Note if the ex parameter is not used it should be omitted.
+Note if the ex parameter is not used it should be omitted. There are only two forms of catch clauses which make sense: a const reference and the ... catch all.
 
 ## Parentheses