diff --git a/package.json b/package.json
index 5d0fcc0..997ef5f 100644
--- a/package.json
+++ b/package.json
@@ -64,6 +64,7 @@
 	},
 	"peerDependencies": {
 		"ink": "^2.1.1",
+		"prop-types": "^15.7.2",
 		"react": "^16.8.6"
 	}
 }
diff --git a/readme.md b/readme.md
index aaeb785..64c12a4 100644
--- a/readme.md
+++ b/readme.md
@@ -15,7 +15,7 @@
 ## Install
 
 ```bash
-$ npm install pasteljs ink react
+$ npm install pasteljs ink react prop-types
 ```