diff --git a/chapter3_traps.md b/chapter3_traps.md
index ef09b48..1109562 100644
--- a/chapter3_traps.md
+++ b/chapter3_traps.md
@@ -1960,8 +1960,8 @@ hartid = 1: Enter supervisor mode...
 hartid = 1: Application: obj/app1
 hartid = 1: Application program entry point (virtual address): 0x0000000085000000
 hartid = 1: Switch to user mode...
-hardid = 0: >>> app0 is expected to be executed by hart0
-hardid = 1: >>> app1 is expected to be executed by hart1
+hartid = 0: >>> app0 is expected to be executed by hart0
+hartid = 1: >>> app1 is expected to be executed by hart1
 hartid = 0: User exit with code:0.
 hartid = 1: User exit with code:0.
 hartid = 0: shutdown with code:0.