diff --git a/README.md b/README.md
index 5536282..d773f98 100644
--- a/README.md
+++ b/README.md
@@ -97,7 +97,7 @@ tcpdump command example: tcpdump -w /tmp/file.cap -s0 -i ath0
 see  [project site](https://onotelli.github.io/justniffer/)
 
 ## Install on Ubuntu
-
+    sudo apt install software-properties-common
     sudo add-apt-repository ppa:oreste-notelli/ppa
     sudo apt update
     sudo apt install justniffer