Documentation/FTL-Format.md

@@ -4,7 +4,7 @@ First the Header structure is written / read directly with no encoding, followed
 ```c++
 struct Header {
     const char magic[4] = {'F','T','L','F'};
-    uint8_t version = 3;
+    uint8_t version = 4;
 };
 ```
 
@@ -55,3 +55,7 @@ No longer valid. Did not have the 64 byte index header and had different packet
 * Use of RGB flag that indicates video is RGB not BGR encoded (HEVC or H264 codec)
 * Calibration and pose should be injected and use msgpack codec
 
+### Version 4
+* Replace `block_count` and `block_total` with `frame_count` and `frame_number`
+* Use tiling to merge multiple sources into a single video frame.
+