diff --git a/README.md b/README.md
index bbd6175..03e7fe0 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ This is a python port of STRF (https://github.com/cbassa/strf), but will include
 Install package dependencies:
 
 ```
-sudo apt install python3-virtualenv python3-pip
+sudo apt install python3-virtualenv python3-pip python3-tk
 ```
 
 Optionally, set up python virtual environment: