diff --git a/include/lib/cpus/aarch64/cpu_macros.S b/include/lib/cpus/aarch64/cpu_macros.S
index 8f0a74f..bfe2449 100644
--- a/include/lib/cpus/aarch64/cpu_macros.S
+++ b/include/lib/cpus/aarch64/cpu_macros.S
@@ -230,6 +230,7 @@
 
 	/* Check whether errata applies */
 	mov	x0, \_rev_var
+	/* Shall clobber: x0-x7 */
 	bl	check_errata_\_id
 
 	.ifeq \_chosen