diff --git a/src/event/CoarseTimerEvent.hxx b/src/event/CoarseTimerEvent.hxx
index c7915b3eb..200f0ed02 100644
--- a/src/event/CoarseTimerEvent.hxx
+++ b/src/event/CoarseTimerEvent.hxx
@@ -51,6 +51,9 @@ public:
 		return due;
 	}
 
+	/**
+	 * Was this timer scheduled?
+	 */
 	bool IsPending() const noexcept {
 		return is_linked();
 	}
diff --git a/src/event/FineTimerEvent.hxx b/src/event/FineTimerEvent.hxx
index f3fbe091b..bd30c6cb5 100644
--- a/src/event/FineTimerEvent.hxx
+++ b/src/event/FineTimerEvent.hxx
@@ -62,6 +62,9 @@ public:
 		return due;
 	}
 
+	/**
+	 * Was this timer scheduled?
+	 */
 	bool IsPending() const noexcept {
 		return is_linked();
 	}