diff --git a/Modules/sre_constants.h b/Modules/sre_constants.h
index 01c8448..2ec00ba 100644
--- a/Modules/sre_constants.h
+++ b/Modules/sre_constants.h
@@ -1,29 +1,42 @@
-/* generated from sre_constants.py */
+/*
+ * Secret Labs' Regular Expression Engine
+ *
+ * regular expression matching engine
+ *
+ * NOTE: This file is generated by sre_constants.py.  If you need
+ * to change anything in here, edit sre_constants.py and run it.
+ *
+ * Copyright (c) 1997-2000 by Secret Labs AB.  All rights reserved.
+ *
+ * See the _sre.c file for information on usage and redistribution.
+ */
+
 #define SRE_OP_FAILURE 0
 #define SRE_OP_SUCCESS 1
 #define SRE_OP_ANY 2
 #define SRE_OP_ASSERT 3
-#define SRE_OP_AT 4
-#define SRE_OP_BRANCH 5
-#define SRE_OP_CALL 6
-#define SRE_OP_CATEGORY 7
-#define SRE_OP_GROUP 8
-#define SRE_OP_GROUP_IGNORE 9
-#define SRE_OP_IN 10
-#define SRE_OP_IN_IGNORE 11
-#define SRE_OP_INFO 12
-#define SRE_OP_JUMP 13
-#define SRE_OP_LITERAL 14
-#define SRE_OP_LITERAL_IGNORE 15
-#define SRE_OP_MARK 16
-#define SRE_OP_MAX_REPEAT 17
-#define SRE_OP_MAX_REPEAT_ONE 18
-#define SRE_OP_MIN_REPEAT 19
-#define SRE_OP_NOT_LITERAL 20
-#define SRE_OP_NOT_LITERAL_IGNORE 21
-#define SRE_OP_NEGATE 22
-#define SRE_OP_RANGE 23
-#define SRE_OP_REPEAT 24
+#define SRE_OP_ASSERT_NOT 4
+#define SRE_OP_AT 5
+#define SRE_OP_BRANCH 6
+#define SRE_OP_CALL 7
+#define SRE_OP_CATEGORY 8
+#define SRE_OP_GROUP 9
+#define SRE_OP_GROUP_IGNORE 10
+#define SRE_OP_IN 11
+#define SRE_OP_IN_IGNORE 12
+#define SRE_OP_INFO 13
+#define SRE_OP_JUMP 14
+#define SRE_OP_LITERAL 15
+#define SRE_OP_LITERAL_IGNORE 16
+#define SRE_OP_MARK 17
+#define SRE_OP_MAX_REPEAT 18
+#define SRE_OP_MAX_REPEAT_ONE 19
+#define SRE_OP_MIN_REPEAT 20
+#define SRE_OP_NOT_LITERAL 21
+#define SRE_OP_NOT_LITERAL_IGNORE 22
+#define SRE_OP_NEGATE 23
+#define SRE_OP_RANGE 24
+#define SRE_OP_REPEAT 25
 #define SRE_AT_BEGINNING 0
 #define SRE_AT_BEGINNING_LINE 1
 #define SRE_AT_BOUNDARY 2