diff --git a/extensions/openpower-pels/callout.hpp b/extensions/openpower-pels/callout.hpp
index c8bb0a3..6b7dbc7 100644
--- a/extensions/openpower-pels/callout.hpp
+++ b/extensions/openpower-pels/callout.hpp
@@ -87,9 +87,10 @@
      * out maintenance procedure.
      *
      * @param[in] priority - The priority of the callout
-     * @param[in] procedure - The maintenance procedure
+     * @param[in] procedureFromRegistry - The maintenance procedure name
+     *                                    as defined in the message registry.
      */
-    Callout(CalloutPriority priority, MaintProcedure procedure);
+    Callout(CalloutPriority priority, const std::string& procedureFromRegistry);
 
     /**
      * @brief Returns the size of this object when flattened into a PEL