diff --git a/tools/apidoc/gen_toc.py b/tools/apidoc/gen_toc.py
index 6ff67c0d4d4..e110b582fba 100644
--- a/tools/apidoc/gen_toc.py
+++ b/tools/apidoc/gen_toc.py
@@ -127,7 +127,6 @@ known_categories = {
     'Pool': 'Pool',
     'VPC': 'VPC', 
     'PrivateGateway': 'VPC',
-    'Simulator': 'simulator',
     'StaticRoute': 'VPC',
     'Tags': 'Resource tags',
     'NiciraNvpDevice': 'Nicira NVP',