diff --git a/README.md b/README.md
index 9c4c8e6..2d85b8e 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,10 @@ RSS_FEED_URL = URL  of  RSS/xml  feed
 
 TOOT_VISIBILITY = 'public', 'unlisted', 'private', or 'direct'
 
+TAG1(2,3) = #hastag
+
+When using env variables TAG1, TAG2, and TAG3, you can only use a single tag and the hash cannot be preceded by a space. This is a limitation of the way linux environment variables work. 
+
 The best way to use this project is by using [its docker container](https://hub.docker.com/r/amitserper/masto-rss)
 When using docker, make a bind mount between /state on the container to whatever directory you want on your machine in order to keep the state of the feeds that were already posted
 ![image](https://github.com/aserper/masto-rss/actions/workflows/masto-rss.yml/badge.svg)