diff --git a/src/bin/d2/d2_process.h b/src/bin/d2/d2_process.h
index 8c6db0e4e1..1213647f59 100644
--- a/src/bin/d2/d2_process.h
+++ b/src/bin/d2/d2_process.h
@@ -213,8 +213,8 @@ protected:
     ///
     /// If callbacks are ready to be executed upon entry, the method will
     /// return as soon as these callbacks have completed.  If no callbacks
-    /// are ready, then it will wait (indefinitely) until at least one callback
-    /// is executed.
+    /// are ready, then it will wait until at least one callback
+    /// is executed or IO_SERVICE_RUN_TIME_USECS elapses.
     ///
     /// @note: Should become desirable to periodically force an
     /// event, an interval timer could be used to do so.