diff --git a/qemu/target/arm/cpu.h b/qemu/target/arm/cpu.h
index 5c21a41e..cd334da3 100644
--- a/qemu/target/arm/cpu.h
+++ b/qemu/target/arm/cpu.h
@@ -173,6 +173,7 @@ typedef struct {
  *  Qn = regs[n].d[1]:regs[n].d[0]
  *  Dn = regs[n].d[0]
  *  Sn = regs[n].d[0] bits 31..0
+ *  Hn = regs[n].d[0] bits 15..0
  *
  * This corresponds to the architecturally defined mapping between
  * the two execution states, and means we do not need to explicitly