diff --git a/doc/api/hooks_client-side.md b/doc/api/hooks_client-side.md
index 8e2d3da79..f9ad9147c 100644
--- a/doc/api/hooks_client-side.md
+++ b/doc/api/hooks_client-side.md
@@ -203,6 +203,13 @@ Things in context:
 
 This hook is called before the content of a node is collected by the usual methods. The cc object can be used to do a bunch of things that modify the content of the pad. See, for example, the heading1 plugin for etherpad original.
 
+E.g. if you need to apply an attribute to newly inserted characters, 
+call cc.doAttrib(state, "attributeName") which results in an attribute attributeName=true.
+
+If you want to specify also a value, call cc.doAttrib(state, "attributeName:value")
+which results in an attribute attributeName=value.
+
+
 ## collectContentImage
 Called from: src/static/js/contentcollector.js