diff --git a/README.md b/README.md
index 63d856b..8cfbc61 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ $ cp geostat.service /lib/systemd/system/
 3) Download latest GeoLiteCity.dat from MaxMind
 ```sh
 $ wget https://geolite.maxmind.com/download/geoip/database/GeoLite2-City.tar.gz
-$ tar -xvf GeoLite2-City.tar.gz
+$ tar -xvzf GeoLite2-City.tar.gz
 $ cp ./GeoLite2-City_some-date/GeoLite2-City.mmdb ./
 ```
 4) Then enable and start service