updated readme for r4

readme.md

@@ -1,6 +1,6 @@
 # Screenshot
 
-![POCSAG decoder](https://i.imgur.com/2iYM8Z7.png)
+![POCSAG decoder](https://i.imgur.com/PsVOdEH.png)
 
 # Installation
 
@@ -18,4 +18,21 @@ Provided the plugin has been loaded successfully, there should be an option to d
 
 NFM with 12kHz bandwidth seems to work reliably, input is taken directly from the demodulator so audio filtering / mute shouldn't affect decoding.
 
-![Plugin directory](https://i.imgur.com/9eGnJ9k.png)
+![Plugin directory](https://i.imgur.com/9eGnJ9k.png)
+
+## Options
+
+### De-duplicate
+The payload of each message is hashed (ignoring the first 9 characters, which seem to often include time data). With this option enabled new messages received with the same hash will be ignored.
+
+### Hide bad decodes
+Any messages that have failed BCH (CRC) or parity checks will be ignored.
+
+### Clear
+Will remove all messages from the buffer.
+
+# Notes
+
+* A maximum of 1000 messages will be displayed in the buffer, on a first-in-first-out basis.
+* If a message payload is empty it is assumed to be tone message.
+* If a message payload has fewer than 16 characters numerically, it is assumed to be a numeric message. In this case the numeric decode will be displayed first with the alphanumeric decode following e.g. "123456 (ALPHA: ABC)"