refine comments

@@ -87,15 +87,6 @@ A big THANK YOU goes to:
 * [FFMPEG][FFMPEG] and [libx264][libx264] group for SRS to use to transcode.
 * Guido van Rossum for creating Python for api-server for SRS.
 
-### Donation
-
-[![Donation](https://www.paypalobjects.com/webstatic/en_US/btn/btn_donate_92x26.png)][donation1]
-[![Paypal](https://www.paypalobjects.com/webstatic/en_US/btn/btn_donate_pp_142x27.png)][donation2]
-
-Donation: [http://www.ossrs.net/srs.release/donation/index.html][donation1]
-
-Donations: [https://github.com/ossrs/srs/blob/develop/DONATIONS.txt][donations]
-
 ## Usage
 
 <strong>Step 1:</strong> Get SRS.
@@ -916,6 +907,10 @@ Remark:
 [![Paypal](https://www.paypalobjects.com/webstatic/en_US/btn/btn_donate_pp_142x27.png)][donation2]
 [![LinkedIn](http://s.c.lnkd.licdn.com/scds/common/u/img/webpromo/btn_liprofile_blue_80x15.png)](http://cn.linkedin.com/in/winlinvip)
 
+Donation: [http://www.ossrs.net/srs.release/donation/index.html][donation1]
+
+Donations: [https://github.com/ossrs/srs/blob/develop/DONATIONS.txt][donations]
+
 Beijing, 2013.10<br/>
 Winlin