diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 069dbf0..9b7206d 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -1,29 +1,29 @@
-# Contributing guide
+# Contribution Guide
 
 ## Setting up the project
 
-Use nvm to set the appropriate Node.js version:
-```
+Use [nvm](https://nvm.sh) to use the appropriate Node.js version from `.nvmrc`:
+```sh
 nvm i
 ```
 
 Install the dependencies using pnpm:
-```
+```sh
 pnpm i
 ```
 
-## Producing a build
+## Building the project
 Run the `build` script:
-```
+```sh
 pnpm build
 ```
 
 The package is bundled using [pkgroll](https://github.com/privatenumber/pkgroll) (Rollup). It infers the entry-points from `package.json` so there are no build configurations.
 
 
-### Watch mode
+### Development (watch) mode
 During development, you can use the watch flag (`--watch, -w`) to automatically rebuild the package on file changes:
-```
+```sh
 pnpm build -w
 ```
 
@@ -31,11 +31,42 @@ pnpm build -w
 Since pkgroll knows the entry-point is a binary (being in `package.json#bin`), it automatically adds the Node.js hashbang to the top of the file, and chmods it so it's executable.
 
 You can run the distribution file in any directory:
-```
+```sh
 ./dist/cli.mjs
 ```
 
-Or in non UNIX environments, you can use Node.js to run the file:
-```
+Or in non-UNIX environments, you can use Node.js to run the file:
+```sh
 node ./dist/cli.mjs
 ```
+
+## Testing
+
+Testing requires passing in `OPENAI_KEY` as an environment variable:
+
+```sh
+OPENAI_KEY=<your OPENAI key> pnpm test
+```
+
+
+You can still run tests that don't require `OPENAI_KEY` but will not test the main functionality:
+```
+pnpm test
+```
+
+
+## Using & testing your changes
+You can publish the package to a GitHub branch using [`git-publish`](https://github.com/privatenumber/git-publish):
+
+Publish your current branch to a GitHub branch:
+```sh
+$ npx git-publish
+
+✔ Successfully published branch! Install with command:
+  → npm i 'Nutlope/aicommits#npm/develop'
+```
+
+Then you can use the output to test the changes:
+```sh
+$ npx 'Nutlope/aicommits#npm/develop' # same as running `npx aicommits`
+```
diff --git a/README.md b/README.md
index a834fff..a4de3c2 100644
--- a/README.md
+++ b/README.md
@@ -119,3 +119,8 @@ Video coming soon where I rebuild it from scratch to show you how to easily buil
 
 
 - **Hiroki Osame**: [@privatenumber](https://github.com/privatenumber) [<img src="https://img.shields.io/twitter/follow/privatenumbr?style=flat&label=privatenumbr&logo=twitter&color=0bf&logoColor=fff" align="center">](https://twitter.com/privatenumbr)
+
+
+## Contributing
+
+If you want to help fix a bug or implement a feature in [Issues](https://github.com/Nutlope/aicommits/issues), checkout the [Contribution Guide](CONTRIBUTING.md) to learn how to setup and test the project.
\ No newline at end of file
diff --git a/package.json b/package.json
index a5181e7..86a6bb3 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
 		"lint": "eslint --cache .",
 		"type-check": "tsc",
 		"test": "tsx tests",
-		"prepack": "pnpm build"
+		"prepack": "pnpm build && clean-pkg-json"
 	},
 	"simple-git-hooks": {
 		"pre-commit": "pnpm lint-staged"
@@ -38,6 +38,7 @@
 		"@types/ini": "^1.3.31",
 		"@types/inquirer": "^9.0.3",
 		"@types/node": "^18.14.2",
+		"clean-pkg-json": "^1.2.0",
 		"cleye": "^1.3.2",
 		"eslint": "^8.35.0",
 		"execa": "^7.0.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 4efe79b..0be6c5e 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -12,6 +12,7 @@ specifiers:
   '@types/ini': ^1.3.31
   '@types/inquirer': ^9.0.3
   '@types/node': ^18.14.2
+  clean-pkg-json: ^1.2.0
   cleye: ^1.3.2
   eslint: ^8.35.0
   execa: ^7.0.0
@@ -35,6 +36,7 @@ devDependencies:
   '@types/ini': 1.3.31
   '@types/inquirer': 9.0.3
   '@types/node': 18.14.2
+  clean-pkg-json: 1.2.0
   cleye: 1.3.2
   eslint: 8.35.0
   execa: 7.0.0
@@ -998,6 +1000,11 @@ packages:
     engines: {node: '>=8'}
     dev: true
 
+  /clean-pkg-json/1.2.0:
+    resolution: {integrity: sha512-QHBWWOtpSCv5nfMFKwyxn4WMvkYE0msxj5xiqejYGqYepWVrK7O/om1Vn6nSl/WPtYn8ge9YmSCbTi1Hp8k+Hg==}
+    hasBin: true
+    dev: true
+
   /clean-regexp/1.0.0:
     resolution: {integrity: sha512-GfisEZEJvzKrmGWkvfhgzcz/BllN1USeqD2V6tg14OAOgaCD2Z/PUEuxnAZ/nPvmaHRG7a8y77p1T/IRQ4D1Hw==}
     engines: {node: '>=4'}