diff --git a/qemu/target/arm/helper.c b/qemu/target/arm/helper.c
index 05e760dd..7a907030 100644
--- a/qemu/target/arm/helper.c
+++ b/qemu/target/arm/helper.c
@@ -9683,6 +9683,10 @@ static inline bool check_for_semihosting(CPUState *cs)
  * Do any appropriate logging, handle PSCI calls, and then hand off
  * to the AArch64-entry or AArch32-entry function depending on the
  * target exception level's register width.
+ *
+ * Note: this is used for both TCG (as the do_interrupt tcg op),
+ *       and KVM to re-inject guest debug exceptions, and to
+ *       inject a Synchronous-External-Abort.
  */
 void arm_cpu_do_interrupt(CPUState *cs)
 {