diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index ee04943b0f..0d8ff49ae1 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -1664,6 +1664,7 @@ static int hvf_sysreg_write(CPUState *cpu, uint32_t reg, uint64_t val)
     return 1;
 }
 
+/* Must be called by the owning thread */
 static int hvf_inject_interrupts(CPUState *cpu)
 {
     if (cpu_test_interrupt(cpu, CPU_INTERRUPT_FIQ)) {