diff --git a/pset1/m61.cc b/pset1/m61.cc
index 095f7ae..cabad03 100644
--- a/pset1/m61.cc
+++ b/pset1/m61.cc
@@ -39,7 +39,7 @@ void m61_free(void* ptr, const char* file, long line) {
 ///    location `file`:`line`.
 
 void* m61_calloc(size_t nmemb, size_t sz, const char* file, long line) {
-    // Your code here (to fix test019).
+    // Your code here (to fix test021).
     void* ptr = m61_malloc(nmemb * sz, file, line);
     if (ptr) {
         memset(ptr, 0, nmemb * sz);