diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index 75787186bd4fcc5c16f859be4d7e1db3dc684cca..51f1fb21f1712e1098585d70e3afb8b3e6dfcbdc 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -30,7 +30,7 @@
 #define RCU_TRACE(stmt)
 #endif /* #else #ifdef CONFIG_RCU_TRACE */
 
-/* Offset to allow for unmatched rcu_irq_{enter,exit}(). */
+/* Offset to allow distinguishing irq vs. task-based idle entry/exit. */
 #define DYNTICK_IRQ_NONIDLE	((LONG_MAX / 2) + 1)