diff --git a/ChangeLog b/ChangeLog
index 61970324..743359c3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2010-07-19  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Updated doc for --min-split-size option.
+	* doc/aria2c.1.txt
+	* src/usage_text.h
+
 2010-07-19  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Added max-connection-per-server, min-split-size and
diff --git a/doc/aria2c.1 b/doc/aria2c.1
index a955cadc..766b8c6a 100644
--- a/doc/aria2c.1
+++ b/doc/aria2c.1
@@ -1231,7 +1231,10 @@ option\&. Default:
 .RS 4
 aria2 does not split less than 2*SIZE byte range\&. For example, let\(cqs consider downloading 20MiB file\&. If SIZE is 10M, aria2 can split file into 2 range [0\-10MiB) and [10MiB\-20MiB) and download it using 2 sources(if
 \fB\-\-split\fR
->= 2, of course)\&. If SIZE is 15M, since 2*15M > 20MiB, aria2 does not split file and download it using 1 source\&. Possible Values:
+>= 2, of course)\&. If SIZE is 15M, since 2*15M > 20MiB, aria2 does not split file and download it using 1 source\&. You can append
+\fIK\fR
+or
+\fIM\fR(1K = 1024, 1M = 1024K)\&. Possible Values:
 \fI1M\fR\-\fI1024M\fR
 Default:
 \fI20M\fR
diff --git a/doc/aria2c.1.html b/doc/aria2c.1.html
index 8abcf9f9..1b2a2534 100644
--- a/doc/aria2c.1.html
+++ b/doc/aria2c.1.html
@@ -2063,7 +2063,8 @@ name.</td>
   split file into 2 range [0-10MiB) and [10MiB-20MiB) and download it
   using 2 sources(if <strong>--split</strong> &gt;= 2, of course).  If SIZE is 15M,
   since 2*15M &gt; 20MiB, aria2 does not split file and download it using
-  1 source.  Possible Values: <em>1M</em>-<em>1024M</em> Default: <em>20M</em>
+  1 source.  You can append <em>K</em> or <em>M</em>(1K = 1024, 1M = 1024K).
+  Possible Values: <em>1M</em>-<em>1024M</em> Default: <em>20M</em>
 </p>
 </dd>
 <dt class="hdlist1">
@@ -4257,7 +4258,7 @@ files in the program, then also delete it here.</p></div>
 <div id="footnotes"><hr /></div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2010-07-19 13:44:22 JST
+Last updated 2010-07-19 13:48:41 JST
 </div>
 </div>
 </body>
diff --git a/doc/aria2c.1.txt b/doc/aria2c.1.txt
index 62095c78..e0076b22 100644
--- a/doc/aria2c.1.txt
+++ b/doc/aria2c.1.txt
@@ -844,7 +844,8 @@ name.
   split file into 2 range [0-10MiB) and [10MiB-20MiB) and download it
   using 2 sources(if *--split* >= 2, of course).  If SIZE is 15M,
   since 2*15M > 20MiB, aria2 does not split file and download it using
-  1 source.  Possible Values: '1M'-'1024M' Default: '20M'
+  1 source.  You can append 'K' or 'M'(1K = 1024, 1M = 1024K).
+  Possible Values: '1M'-'1024M' Default: '20M'
 
 *--log-level*=LEVEL::
   Set log level to output.
diff --git a/src/usage_text.h b/src/usage_text.h
index 0c0c7e93..1db7a318 100644
--- a/src/usage_text.h
+++ b/src/usage_text.h
@@ -693,7 +693,8 @@
     "                              range [0-10MiB) and [10MiB-20MiB) and download it\n" \
     "                              using 2 sources(if --split >= 2, of course).\n" \
     "                              If SIZE is 15M, since 2*15M > 20MiB, aria2 does\n" \
-    "                              not split file and download it using 1 source.")
+    "                              not split file and download it using 1 source.\n" \
+    "                              You can append K or M(1K = 1024, 1M = 1024K).")
 #define TEXT_CONDITIONAL_GET                    \
   _(" --conditional-get[=true|false] Download file only when the local file is older\n" \
     "                              than remote file. Currently, this function has\n" \