diff --git a/README.md b/README.md
index 56dafc4..36df873 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,66 @@
-# fastify-openapi-merge
\ No newline at end of file
+# fastify-openapi-merge
+
+`fastify-openapi-merge` is a `Fastify` plugin that merges OpenAPI specifications from multiple files and serves the merged output as JSON or YAML. This plugin simplifies managing modular OpenAPI specifications, enabling dynamic merging and serving of your API definitions.
+
+## Installation
+
+Install the plugin using npm
+```bash
+npm install fastify-openapi-merge
+```
+
+## Usage
+
+Register the plugin in your Fastify application and specify the required options:
+```javascript
+const path = require('node:path')
+const fastify = require('fastify')();
+const fastifyOpenapiMerge = require('fastify-openapi-merge');
+
+fastify.register(fastifyOpenapiMerge, {
+  specDir: path.join(__dirname, 'specs'), // Directory or array of directories containing OpenAPI files
+  routePrefix: '/openapi', // Base route for serving the OpenAPI specification
+  specDefinition: {
+    openapi: '3.0.0',
+    info: {
+      title: 'My API',
+      version: '1.0.0',
+    },
+  },
+});
+
+fastify.listen({ port: 3000 }, (err) => {
+  if (err) throw err;
+  console.log('Server listening on http://localhost:3000');
+});
+
+```
+
+## Options
+
+- `specDir` (required): directory path or an array of directory paths containing OpenAPI specification files (`.yaml`, `.yml`, `.json`).
+- `routePrefix` (optional): The base route prefix for serving the merged specification. Default: `/openapi`.
+- `merge` (optional): A custom function to define how multiple specifications are merged. The function receives an array of parsed specifications.
+- `specDefinition` (optional): The base OpenAPI definition that will be included in the merged result.
+
+## Routes
+
+The plugin exposes two routes for serving the merged OpenAPI specification:
+- `GET <routePrefix>/json` Returns the merged specification in JSON format.
+- `GET <routePrefix>/yaml` Returns the merged specification in YAML format.
+
+## Example
+
+If you set routePrefix: `'/docs'`, the plugin will expose the following routes:
+- `GET /docs/json` Serves the merged specification in JSON format.
+- `GET /docs/yaml` Serves the merged specification in YAML format.
+
+## Features
+
+- **Glob Support**: Automatically finds OpenAPI files (`.yaml`, `.yml`, `.json`) in the specified directories.
+- **Custom Merging Logic**: Supports user-defined merging strategies.
+- **Multiple Formats**: Serves the merged specification in both JSON and YAML formats.
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](https://github.com/inyourtime/fastify-openapi-merge/blob/main/LICENSE) file for details.
diff --git a/package.json b/package.json
index 44ae25b..4d012f4 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,13 @@
     "type": "git",
     "url": "git+https://github.com/inyourtime/fastify-openapi-merge.git"
   },
-  "keywords": [],
+  "keywords": [
+    "fastify",
+    "openapi",
+    "swagger",
+    "merge",
+    "serve"
+  ],
   "author": "inyourtime (https://github.com/inyourtime)",
   "license": "MIT",
   "bugs": {