diff --git a/README.md b/README.md
index d04335e..350e926 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,6 @@
 # filtus
 Software for analysis of exome sequencing data.
+
+For use on linux you may need to run:
+
+`sudo apt-get install tk tk-dev`