diff --git a/contributing/code/standards.rst b/contributing/code/standards.rst
index f6bb4bb3bf9..7ef94607ee9 100644
--- a/contributing/code/standards.rst
+++ b/contributing/code/standards.rst
@@ -108,12 +108,16 @@ Naming Conventions
 
 * Use namespaces for all classes;
 
-* Abstract classes are often prefixed with ``Abstract``;
+* Prefix abstract classes ``Abstract``. Please note some early Symfony2 classes
+  do not follow this convention and have not been renamed for backward compatibility
+  reasons. However all new abstract classes must follow this naming convention;
 
 * Suffix interfaces with ``Interface``;
 
 * Suffix traits with ``Trait``;
 
+* Suffix exceptions with ``Exception``;
+
 * Use alphanumeric characters and underscores for file names;
 
 * Don't forget to look at the more verbose :doc:`conventions` document for