diff --git a/object_msgs/srv/ObjectInfo.srv b/object_msgs/srv/ObjectInfo.srv
index 6eef2b84d9618f03df50aba4bd4c1a6bf3266462..8e8bdcf741ed7d467257e18350a2055d760f7af5 100644
--- a/object_msgs/srv/ObjectInfo.srv
+++ b/object_msgs/srv/ObjectInfo.srv
@@ -9,8 +9,16 @@ bool get_geometry
 ---
 
 # true if object exists and information is
-# stored in field 'object'
+# stored in field 'object'. If false, the
+# error_code contains more information about the error.
 bool success
 
 # information about the object
 Object object
+
+# error code if success is false
+byte error_code
+
+byte NO_ERROR=0
+byte OBJECT_NOT_FOUND=1
+byte OTHER_ERROR=2