diff --git a/README.md b/README.md
index 7974733..debb513 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,21 @@
-# post2discord
-Simple Python Script to post/update a message on Discord via Webhook
+# post2discord.py
+
+A simple Python script to post/update a message on Discord via Webhook
+
+usage: post2discord.py [-h] [--id ID] [--username USERNAME] url message
+
+post or update a message on a Discord webhook, returns message.id on success
+
+positional arguments:
+  url                  webhook URL
+  message              "the message contents"
+
+optional arguments:
+  -h, --help           show this help message and exit
+  --id ID              message.id to update
+  --username USERNAME  override the default username of the webhook, will be ignored by Discord if we are updating
+
+examples:
+  post2discord.py https://discord.com/api/123456789098765432/xx_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx-xxxxxx "Hello world!"
+  post2discord.py --username Mr.X https://discord.com/api/123456789098765432/xx_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx-xxxxxx "Hello world!"
+  post2discord.py --id 234567890987654321 https://discord.com/api/123456789098765432/xx_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx-xxxxxx "Hello updated world!"
diff --git a/post2discord.py b/post2discord.py
new file mode 100644
index 0000000..a5f589b
--- /dev/null
+++ b/post2discord.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+# post2discord.py
+# A smple Python script to post/update a message on Discord via Webhook
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation, either version 3 of the License, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program. If not, see <http://www.gnu.org/licenses/>.
+
+import json
+import argparse
+import requests
+
+parser = argparse.ArgumentParser(description='post or update a message on a Discord webhook, returns message.id on success')
+parser.add_argument ('url', help='webhook URL')
+parser.add_argument ('message', help='"the message contents"')
+parser.add_argument ('--id', help='message.id to update')
+parser.add_argument ('--username', help='override the default username of the webhook, will be ignored by Discord if we are updating')
+args = parser.parse_args()
+
+data = { 'content': args.message }
+if args.username:  data['username'] = args.username
+
+if args.id is None:
+	response = requests.post(args.url+'?wait=true',data)
+else:
+	response = requests.patch(args.url+'/messages/'+args.id+'?wait=true',data)
+
+if response.ok:
+	jsonres = response.json()
+	print(jsonres['id'])
+else:
+	print('%s: %s',response.status_code, response.text)