diff --git a/doc/api/hooks_client-side.md b/doc/api/hooks_client-side.md
index b8a58b31..ca429a07 100644
--- a/doc/api/hooks_client-side.md
+++ b/doc/api/hooks_client-side.md
@@ -80,6 +80,22 @@ This hook is called during the attribute processing procedure, and should be use
 
 The return value for this function should be a list of classes, which will then be parsed into a valid class string.
 
+## aceAttribClasses
+Called from: src/static/js/linestylefilter.js
+
+Things in context:
+1. Attributes - Object of Attributes
+
+This hook is called when attributes are investigated on a line.  It is useful if you want to add another attribute type or property type to a pad.
+
+Example:
+```
+exports.aceAttribClasses = function(hook_name, attr, cb){
+  attr.sub = 'tag:sub';
+  cb(attr);
+}
+```
+
 ## aceGetFilterStack
 Called from: src/static/js/linestylefilter.js
 
diff --git a/doc/api/hooks_server-side.md b/doc/api/hooks_server-side.md
index e730f18e..69f5ab5c 100644
--- a/doc/api/hooks_server-side.md
+++ b/doc/api/hooks_server-side.md
@@ -264,6 +264,23 @@ exports.stylesForExport = function(hook, padId, cb){
 }
 ```
 
+## aceAttribClasses
+Called from: src/static/js/linestylefilter.js
+
+Things in context:
+1. Attributes - Object of Attributes
+
+This hook is called when attributes are investigated on a line.  It is useful if you want to add another attribute type or property type to a pad.
+
+Example:
+
+```
+exports.aceAttribClasses = function(hook_name, attr, cb){
+  attr.sub = 'tag:sub';
+  cb(attr);
+}
+```
+
 ## exportFileName
 Called from src/node/handler/ExportHandler.js