episode 2 - fix readme

README.md

@@ -4,6 +4,8 @@ This respository holds all the source code for [this YouTube tutorial series](ht
 
 You can find the revision for a specific episode on [this page](https://github.com/davidcallanan/yt-os-series/tags).
 
+You can find pre-built ISO files for this kernel at [this repository](https://github.com/davidcallanan/os-series-isos).
+
 Considering supporting this work via [my Patreon page](http://patreon.com/codepulse).
 
 ## Prerequisites
@@ -21,7 +23,8 @@ Build an image for our build-environment:
 ## Build
 
 Enter build environment:
- - Linux or MacOS: `docker run --rm -it -v "$pwd":/root/env myos-buildenv`
+ - Linux: `docker run --rm -it -v "$pwd":/root/env myos-buildenv`
+ - MacOS: `docker run --rm -it -v "$PWD":/root/env myos-buildenv`
  - Windows (CMD): `docker run --rm -it -v "%cd%":/root/env myos-buildenv`
  - Windows (PowerShell): `docker run --rm -it -v "${pwd}:/root/env" myos-buildenv`
  - NOTE: If you are having trouble with an unshared drive, ensure your docker daemon has access to the drive you're development environment is in. For Docker Desktop, this is in "Settings > Shared Drives" or "Settings > Resources > File Sharing".