diff --git a/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/000-EntityDefinitions/002-Attributes.yaml b/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/000-EntityDefinitions/002-Attributes.yaml
index 080e316..bcf8a35 100644
--- a/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/000-EntityDefinitions/002-Attributes.yaml
+++ b/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/000-EntityDefinitions/002-Attributes.yaml
@@ -71,6 +71,7 @@
   - IDA_MultipleValidClasses: '{52c67121-6ba1-4d3d-a718-7fcb5d3ae291}'
   - IDA_Shared: '{4f4f2b73-6b16-4cbb-a254-a9e557040bca}'
   - IDA_UserIsLoggedIn: '{8e93d9f3-a897-4c97-935c-b3427f90633b}'
+  - IDA_IncludeSubclasses: '{bc95f90e-d373-48be-b71e-283695afed5a}'
   - IDA_ModuleHasParentModule: '{dd439c24-fb12-48b0-8b11-1b8d473cadef}'
   - IDA_Derived: '{66991ca1-ef08-4f30-846c-4984c2a3139d}'
   - IDA_Index: '{0f31b9ca-e3e2-4c62-8c9e-b55f16eafbf9}'
diff --git a/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/003-Classes/00005-BooleanAttribute.yaml b/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/003-Classes/00005-BooleanAttribute.yaml
index e4beac9..6b10612 100644
--- a/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/003-Classes/00005-BooleanAttribute.yaml
+++ b/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/003-Classes/00005-BooleanAttribute.yaml
@@ -117,6 +117,9 @@
     - instance: '&IDA_UserIsLoggedIn;'
       index: 57
       name: 'User is Logged In'
+    - instance: '&IDA_IncludeSubclasses;'
+      index: 63
+      name: 'Include Subclasses'
 
     - instance: '&IDA_ModuleHasParentModule;'
       index: 60