diff --git a/README b/README
index ad41bf76..14710baa 100644
--- a/README
+++ b/README
@@ -8,7 +8,7 @@ Status
     This module is under active development and is already production ready.
 
 Version
-    This document describes ngx_lua v0.3.1rc7
+    This document describes ngx_lua v0.3.1rc8
     (<https://github.com/chaoslawful/lua-nginx-module/downloads>) released
     on 23 September 2011.
 
@@ -1432,7 +1432,44 @@ Nginx API for Lua
     context: *set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*,
     header_filter_by_lua**
 
-    Decode "str" as a base64 digest to the raw form.
+    Decodes the "str" argument as a base64 digest to the raw form. Returns
+    "nil" if "str" is not well formed.
+
+  ngx.crc32_short
+    syntax: *intval = ngx.crc32_short(str)*
+
+    context: *set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*,
+    header_filter_by_lua**
+
+    Calculates the CRC-32 (Cyclic Redundancy Code) digest for the "str"
+    argument.
+
+    This method performs better on relatively short "str" inputs (i.e., less
+    than 30 ~ 60 bytes), as compared to ngx.crc32_long. The result is
+    exactly the same as ngx.crc32_long.
+
+    Behind the scene, it is just a thin wrapper around the "ngx_crc32_short"
+    function defined in the Nginx core.
+
+    This API was first introduced in the "v0.3.1rc8" release.
+
+  ngx.crc32_long
+    syntax: *intval = ngx.crc32_long(str)*
+
+    context: *set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*,
+    header_filter_by_lua**
+
+    Calculates the CRC-32 (Cyclic Redundancy Code) digest for the "str"
+    argument.
+
+    This method performs better on relatively long "str" inputs (i.e.,
+    longer than 30 ~ 60 bytes), as compared to ngx.crc32_short. The result
+    is exactly the same as ngx.crc32_short.
+
+    Behind the scene, it is just a thin wrapper around the "ngx_crc32_long"
+    function defined in the Nginx core.
+
+    This API was first introduced in the "v0.3.1rc8" release.
 
   ngx.today
     syntax: *str = ngx.today()*
diff --git a/README.markdown b/README.markdown
index 0ac1ffb6..c2844e26 100644
--- a/README.markdown
+++ b/README.markdown
@@ -13,7 +13,7 @@ This module is under active development and is already production ready.
 Version
 =======
 
-This document describes ngx_lua [v0.3.1rc7](https://github.com/chaoslawful/lua-nginx-module/downloads) released on 23 September 2011.
+This document describes ngx_lua [v0.3.1rc8](https://github.com/chaoslawful/lua-nginx-module/downloads) released on 23 September 2011.
 
 Synopsis
 ========
@@ -1623,7 +1623,35 @@ ngx.decode_base64
 
 **context:** *set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua**
 
-Decode `str` as a base64 digest to the raw form.
+Decodes the `str` argument as a base64 digest to the raw form. Returns `nil` if `str` is not well formed.
+
+ngx.crc32_short
+---------------
+**syntax:** *intval = ngx.crc32_short(str)*
+
+**context:** *set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua**
+
+Calculates the CRC-32 (Cyclic Redundancy Code) digest for the `str` argument.
+
+This method performs better on relatively short `str` inputs (i.e., less than 30 ~ 60 bytes), as compared to [ngx.crc32_long](http://wiki.nginx.org/HttpLuaModule#ngx.crc32_long). The result is exactly the same as [ngx.crc32_long](http://wiki.nginx.org/HttpLuaModule#ngx.crc32_long).
+
+Behind the scene, it is just a thin wrapper around the `ngx_crc32_short` function defined in the Nginx core.
+
+This API was first introduced in the `v0.3.1rc8` release.
+
+ngx.crc32_long
+--------------
+**syntax:** *intval = ngx.crc32_long(str)*
+
+**context:** *set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua**
+
+Calculates the CRC-32 (Cyclic Redundancy Code) digest for the `str` argument.
+
+This method performs better on relatively long `str` inputs (i.e., longer than 30 ~ 60 bytes), as compared to [ngx.crc32_short](http://wiki.nginx.org/HttpLuaModule#ngx.crc32_short).  The result is exactly the same as [ngx.crc32_short](http://wiki.nginx.org/HttpLuaModule#ngx.crc32_short).
+
+Behind the scene, it is just a thin wrapper around the `ngx_crc32_long` function defined in the Nginx core.
+
+This API was first introduced in the `v0.3.1rc8` release.
 
 ngx.today
 ---------
diff --git a/doc/HttpLuaModule.wiki b/doc/HttpLuaModule.wiki
index b7b895b1..a5de032d 100644
--- a/doc/HttpLuaModule.wiki
+++ b/doc/HttpLuaModule.wiki
@@ -10,7 +10,7 @@ This module is under active development and is already production ready.
 
 = Version =
 
-This document describes ngx_lua [https://github.com/chaoslawful/lua-nginx-module/downloads v0.3.1rc7] released on 23 September 2011.
+This document describes ngx_lua [https://github.com/chaoslawful/lua-nginx-module/downloads v0.3.1rc8] released on 23 September 2011.
 
 = Synopsis =
 <geshi lang="nginx">
@@ -1570,7 +1570,33 @@ Encode <code>str</code> to a base64 digest.
 
 '''context:''' ''set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*''
 
-Decode <code>str</code> as a base64 digest to the raw form.
+Decodes the <code>str</code> argument as a base64 digest to the raw form. Returns <code>nil</code> if <code>str</code> is not well formed.
+
+== ngx.crc32_short ==
+'''syntax:''' ''intval = ngx.crc32_short(str)''
+
+'''context:''' ''set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*''
+
+Calculates the CRC-32 (Cyclic Redundancy Code) digest for the <code>str</code> argument.
+
+This method performs better on relatively short <code>str</code> inputs (i.e., less than 30 ~ 60 bytes), as compared to [[#ngx.crc32_long|ngx.crc32_long]]. The result is exactly the same as [[#ngx.crc32_long|ngx.crc32_long]].
+
+Behind the scene, it is just a thin wrapper around the <code>ngx_crc32_short</code> function defined in the Nginx core.
+
+This API was first introduced in the <code>v0.3.1rc8</code> release.
+
+== ngx.crc32_long ==
+'''syntax:''' ''intval = ngx.crc32_long(str)''
+
+'''context:''' ''set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*''
+
+Calculates the CRC-32 (Cyclic Redundancy Code) digest for the <code>str</code> argument.
+
+This method performs better on relatively long <code>str</code> inputs (i.e., longer than 30 ~ 60 bytes), as compared to [[#ngx.crc32_short|ngx.crc32_short]].  The result is exactly the same as [[#ngx.crc32_short|ngx.crc32_short]].
+
+Behind the scene, it is just a thin wrapper around the <code>ngx_crc32_long</code> function defined in the Nginx core.
+
+This API was first introduced in the <code>v0.3.1rc8</code> release.
 
 == ngx.today ==
 '''syntax:''' ''str = ngx.today()''