1 files changed, 3 insertions, 0 deletions
diff --git a/src/core/unit.h b/src/core/unit.h
index 11804d8bc..b40f034de 100644
--- a/src/core/unit.h
+++ b/src/core/unit.h
@@ -358,6 +358,9 @@ struct UnitVTable {
         /* Return the set of units that are following each other */
         int (*following_set)(Unit *u, Set **s);
 
+        /* Called whenever CLOCK_REALTIME made a jump */
+        void (*time_change)(Unit *u);
+
         /* This is called for each unit type and should be used to
          * enumerate existing devices and load them. However,
          * everything that is loaded here should still stay in