diff --git a/nemu/src/monitor/sdb/addrexp.y b/nemu/src/monitor/sdb/addrexp.y
index 64baee2..ab5035b 100644
--- a/nemu/src/monitor/sdb/addrexp.y
+++ b/nemu/src/monitor/sdb/addrexp.y
@@ -43,7 +43,7 @@ expression
       }
     | '-' number { $$ = -$2; }
     | '*' expression {
-      printf("deref: %u - %#x\n", $2, vaddr_read($2, WORD_BYTES));
+      // printf("deref: %u, value: %#x\n", $2, vaddr_read($2, WORD_BYTES));
       $$ = vaddr_read($2, WORD_BYTES);
     }
     | '(' expression ')' { $$ = $2; }