diff --git a/docs/source/development/messaging.txt b/docs/source/development/messaging.txt
index ef48379..641b48a 100644
--- a/docs/source/development/messaging.txt
+++ b/docs/source/development/messaging.txt
@@ -481,6 +481,8 @@ Message type: ``object_info_reply``::
     # can also be a string like 'Magic function' or 'System alias'
     'type_name' : str,
 
+    # The string form of the object, possibly truncated for length if 
+    # detail_level is 0
     'string_form' : str,
 
     # For objects with a __class__ attribute this will be set