diff --git a/arch/risc-v/include/irq.h b/arch/risc-v/include/irq.h
index 9d587b6d3d..4be5c124f4 100644
--- a/arch/risc-v/include/irq.h
+++ b/arch/risc-v/include/irq.h
@@ -124,7 +124,7 @@
 #define REG_X3_NDX          3
 #define REG_X4_NDX          4
 
-/* $5-$7 = t0-t3: Temporary registers */
+/* $5-$7 = t0-t2: Temporary registers */
 
 #define REG_X5_NDX          5
 #define REG_X6_NDX          6
@@ -134,7 +134,7 @@
 
 #define REG_X8_NDX          8
 
-/* $89 s1 Saved register */
+/* $9 s1 Saved register */
 
 #define REG_X9_NDX          9