diff --git a/README.md b/README.md
index 4670962..5a37984 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,10 @@
 sudo su -
 
 # install the supporting packages and libraries
-apt install --fix-missing build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev libffi-dev liblzma-dev
+apt install --fix-missing build-essential libssl-dev zlib1g-dev \
+                          libbz2-dev libreadline-dev libsqlite3-dev \
+                          wget curl llvm libncurses5-dev libncursesw5-dev \
+                          xz-utils tk-dev libffi-dev liblzma-dev tk-dev tcl-dev
 
 # untar the source code
 tar -xvf Python-2.7.18.tgz