diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index bfccf5e9a2..ee04943b0f 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -2192,6 +2192,7 @@ static inline bool hvf_arm_hw_debug_active(CPUState *cpu)
     return ((cur_hw_wps > 0) || (cur_hw_bps > 0));
 }
 
+/* Must be called by the owning thread */
 static void hvf_arch_set_traps(CPUState *cpu)
 {
     bool should_enable_traps = false;