Modest text revisions

Author: dansanderson

README.md

@@ -6,15 +6,15 @@ This collection is maintained for the benefit of the Lexaloffle community. Sourc
 
 ## PICO-8 file format routines
 
-The PICO-8 fantasy game console stores game cartridges in one of several documented file formats. The most canonical file format is the [P8PNG](https://pico-8.fandom.com/wiki/P8PNGFileFormat) format (`.p8.png`), an encoding of the game data stored stegonographically with a PNG image of the game's "cartridge." The Lua code for a cartridge is compressed using one of two documented proprietary methods: the legacy `:c:` method and the newer `pxa` method.
+The PICO-8 fantasy game console stores game data in one of several documented file formats. The canonical file format is the [P8PNG](https://pico-8.fandom.com/wiki/P8PNGFileFormat) format (`.p8.png`), an encoding of the data stored stegonographically with a PNG image of the game's "cartridge." Game data consists of several regions for graphics, sound, music, and Lua code. In the P8PNG format, the Lua region is compressed using one of two documented proprietary methods: the legacy `:c:` method and the newer `pxa` method.
 
 This repository contains C routines that can compress and decompress data using the two methods:
 
 * `pxa_compress_snippets.c`: the PXA method, supported by PICO-8 versions 0.2.0 and newer
 * `p8_compress.c`: the legacy `:c:` method, supported by all versions of PICO-8
-  * This includes `FUTURE_CODE` that was injected for forwards compatibility with PICO-8 0.1.7. This was added to the default wrapper code in PICO-8 0.1.8 and no longer needs to be injected by the save routine.
+  * This includes `FUTURE_CODE` that was injected for forwards compatibility at PICO-8 version 0.1.7. This was added to the default wrapper code in PICO-8 0.1.8 and no longer needs to be injected by the save routine.
 
-This code was created and officially released by Lexaloffle Games LLP under open source licenses. See each file for the text of the license.
+This compression code was created and officially released by Lexaloffle Games LLP under open source licenses. See each file for the text of the respective license.
 
 For a Python implementation of the complete P8PNG format including stegonographic decoding, see [picotool](https://github.com/dansanderson/picotool). (As of this writing, picotool only supports `:c:` compression.)