diff --git a/crc/crc32.c b/crc/crc32.c
index 56ce0dd..b352dd0 100644
--- a/crc/crc32.c
+++ b/crc/crc32.c
@@ -1,8 +1,14 @@
 /*
 ** The crc32 is licensed under the Apache License, Version 2.0, and a copy of the license is included in this file.
 **
-**Author:Wang Yaofu voipman@qq.com
-**Description: The source file of class crc32.
+** Author:Wang Yaofu voipman@qq.com
+** Description: The source file of class crc32.
+**  CRC32 implementation according to IEEE standards.
+**  Polynomials are represented in LSB-first form
+**  following parameters:
+**    Width                      : 32 bit
+**    Poly                       : 0xedb88320 (That is actually x^8 + x^5 + x^4 + 1)
+**    Output for "123456789"     : 0xCBF43926
 */
 #include <stdlib.h>
 #include "crc32.h"