diff --git a/control/json/manager.hpp b/control/json/manager.hpp
index 7da379a..0f9ff5f 100644
--- a/control/json/manager.hpp
+++ b/control/json/manager.hpp
@@ -565,7 +565,8 @@
 
     /**
      * @brief Insert managed objects into cache, but filter out properties
-     * containing unwanted NaN (not-a-number) values.
+     * containing unwanted NaN (not-a-number) values and properties that
+     * are on D-Bus paths that aren't in an existing Group object.
      *
      * @param[in] ref - The map of ManagedObjects to insert into cache
      */