diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index ab8b396428da..b27dac4a9c0f 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -59,7 +59,7 @@
 	mrs	\tmp, mdscr_el1
 	bic	\tmp, \tmp, #DBG_MDSCR_SS
 	msr	mdscr_el1, \tmp
-	isb	// Synchronise with enable_dbg
+	isb	// Take effect before a subsequent clear of DAIF.D
 9990:
 	.endm