adding hacks documentation

README.md

@@ -4,7 +4,7 @@ Welcome brave adventurer! If you're still into classic 8-bit / 16-bit home compu
 
 ## Current version
 
-`2.0` Helix Nebula
+`2.0.1` Helix Nebula
 
 ## Build Targets
 
@@ -369,6 +369,13 @@ mkdir ~/FictionTools/punycustom
 
 So what does it do? Let's assume for a moment that you want to replace a PunyInform library file. Not just a few routines but the whole file. That's what it is for. Every file you place in `punycustom` that has the same name as a PunyInform library file, is used upon compilation instead. The most common scenario would be replacing the library's standard messages found in `messages.h` with your own implementation. Another common scenario would be replacing one of the PunyInform library extensions with a customized version.
 
+## Hacks
+
+Hacks are settings which you can add to the configuration file of your project to override the default behavior of the Puny BuildTools. All hacks are case-sensitive.
+
+### APPLE2_Z3_INFOCOM=true
+Builds Apple II Z-machine version 3 targets with Infocom's interpreter version K instead of Vezza. This hack is ignored if `ZVERSION 5` is defined in your project's configuration file.
+
 ## Credits
 
 Special thanks to Shawn Sijnstra, Fredrik Ramsberg, Johan Berntsson, Andrew Plotkin, Graham Nelson, Marco Innocenti, the community on the Puny Discord server, the authors of all the free and open-sourced utilities being used in the backend of the Puny BuildTools, those great individuals who directly or indirectly contributed to this project, Sebastian Bach from PolyPlay, Ant Stiller, the ZZAP!64 crew, Jason Scott and most importantly the great masters themselves, once known as Infocom.