diff --git a/package.json b/package.json
index 674553e..4d8257d 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,8 @@
 {
   "name": "react-power-picture",
   "version": "0.0.0-development",
-  "description": "A React component for rendering images both resposively and progressively",
+  "description":
+    "A React component for rendering images both resposively and progressively",
   "keywords": [
     "react",
     "responsive",
@@ -31,7 +32,7 @@
   "license": "MIT",
   "peerDependencies": {
     "react": "^15.0.0-0 || ^16.0.0-0",
-    "react-dom": "^15.0.0-0 || ^16.0.0-0"
+    "prop-types": "^15.6.1"
   },
   "sideEffects": false,
   "devDependencies": {
@@ -45,6 +46,7 @@
     "coveralls": "^3.0.1",
     "cz-conventional-changelog": "^2.1.0",
     "gh-pages": "^1.1.0",
+    "prop-types": "^15.6.1",
     "react": "^16.4.0",
     "react-dom": "^16.4.0",
     "react-scripts": "^1.1.4",
@@ -58,9 +60,7 @@
     "semantic-release": "^15.5.0",
     "travis-deploy-once": "^5.0.0"
   },
-  "files": [
-    "dist"
-  ],
+  "files": ["dist"],
   "czConfig": {
     "path": "node_modules/cz-conventional-changelog"
   }
diff --git a/src/index.js b/src/index.js
index 7104a60..75895d3 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,6 +1,18 @@
 import React, { Component } from 'react';
+import PropTypes from 'prop-types';
 
 class PowerPicture extends Component {
+  static propTypes = {
+    sources: PropTypes.arrayOf(
+      PropTypes.shape({
+        src: PropTypes.string,
+        size: PropTypes.number
+      })
+    ).isRequired,
+    onError: PropTypes.func,
+    children: PropTypes.func
+  };
+
   constructor(props) {
     super(props);
 
diff --git a/yarn.lock b/yarn.lock
index ccde2ee..94b8e64 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6775,7 +6775,7 @@ promise@^7.1.1:
   dependencies:
     asap "~2.0.3"
 
-prop-types@^15.5.10, prop-types@^15.6.0:
+prop-types@^15.5.10, prop-types@^15.6.0, prop-types@^15.6.1:
   version "15.6.1"
   resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.6.1.tgz#36644453564255ddda391191fb3a125cbdf654ca"
   dependencies: