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--- a/README.md
+++ b/README.md
@@ -1,2 +1,15 @@
-# twilio-time-and-temperature
+# Twilio Time & Temperature
 Make your own Time and Temperature phone number / sms service!
+
+## Prerequisites
+
+- A Twilio account
+- A Weather Underground API account
+- A publicly-accessible server running PHP
+
+## Installation
+
+- Copy the time-temp.inc.php.dist file to time-temp.inc.php and modify with your Twilio and WUnderground details.
+- Access time-temp.php to ensure it's working (should generate XML.)
+- Set your Twilio phone number(s) to send an HTTP POST WebHook to the time-temp.php public URL.
+- Call/text the number to test!