diff --git a/tutorial02/test.c b/tutorial02/test.c
index 6e3ebed2..eaa5db69 100644
--- a/tutorial02/test.c
+++ b/tutorial02/test.c
@@ -107,7 +107,7 @@ static void test_parse_root_not_singular() {
 
 #if 0
     /* invalid number */
-    TEST_ERROR(LEPT_PARSE_ROOT_NOT_SINGULAR, "0123"); /* after zero should be '.' or nothing */
+    TEST_ERROR(LEPT_PARSE_ROOT_NOT_SINGULAR, "0123"); /* after zero should be '.' , 'E' , 'e' or nothing */
     TEST_ERROR(LEPT_PARSE_ROOT_NOT_SINGULAR, "0x0");
     TEST_ERROR(LEPT_PARSE_ROOT_NOT_SINGULAR, "0x123");
 #endif