diff --git a/validator/autotrust.h b/validator/autotrust.h
index 211c58c6c..d5cbe2622 100644
--- a/validator/autotrust.h
+++ b/validator/autotrust.h
@@ -67,7 +67,7 @@ struct autr_ta {
 	struct autr_ta* next;
 	/** the RR */
 	ldns_rr* rr;
-	/** last update of key */
+	/** last update of key state (not the pending count) */
 	time_t last_change;
 	/** 5011 state */
 	autr_state_t s;