diff --git a/README.md b/README.md
index c36ab1d..54c616f 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,14 @@
-# twitter-timeline-cleaner
+# Twitter timeline cleaner
 Clean your Twitter timeline
+
+Before run, remember to set those environment variables:
+
+> export TWITTER_ACCESS_TOKEN=''
+> export TWITTER_ACCESS_TOKEN_SECRET=''
+> export TWITTER_CONSUMER_KEY=''
+> export TWITTER_CONSUMER_SECRET=''
+> export TWITTER_NAME='@[your_twitter_name]'
+
+and follow instructions how to claim a [Twitter developers account](https://developer.twitter.com/en/apply) and [how to create your app](https://developer.twitter.com/en/apps/create), needed to fetch tokens and keys to your Twitter timeline.
+
+Work inspired by [delete-tweets](https://github.com/koenrh/delete-tweets) by Koen Rouwhorst