Update README.md

Author: lukeweber

README.md

@@ -1,7 +1,11 @@
 iLBC Android
 ==========
 
-[Internet low bitrate codec](http://en.wikipedia.org/wiki/Internet_Low_Bit_Rate_Codec). This is a swc that wraps the base functionality of the iLBC codec now maintained by google as part of the [WebRTC](http://www.webrtc.org/) project.
+[Internet low bitrate codec](http://en.wikipedia.org/wiki/Internet_Low_Bit_Rate_Codec). Wrapper and shared objects to use ilbc in android.
+
+ilbc quirks
+* Call resetEncoder/Decoder between encoding or decoding entirely new audio clicks, not in between encoding chunks of a stream, if you get this wrong you'll hear clicking. Read next point for technical reason.
+* Encoded audio from ilbc starts with a block of zeros. See http://www.ietf.org/rfc/rfc3951.txt, Specifically: "The input to the LPC analysis module is a possibly high-pass filtered speech buffer, speech_hp, that contains 240/300 (LPC_LOOKBACK + BLOCKL = 80/60 + 160/240 = 240/300) speech samples, where samples 0 through 79/59 are from the previous block and samples 80/60 through 239/299 are from the current block.  No look-ahead into the next block is used.  For the very first block processed, the look-back samples are assumed to be zeros."
 
 Changes
 * Built based on webrtc trunk