diff --git a/install.sh b/install.sh
index 5cd1eae5..682817f0 100755
--- a/install.sh
+++ b/install.sh
@@ -69,6 +69,7 @@ usage() {
   printf "  %-25s%s\n" "-o, --opacity VARIANTS" "Specify theme opacity variant(s) [standard|solid] (Default: All variants)"
   printf "  %-25s%s\n" "-c, --color VARIANTS" "Specify theme color variant(s) [light|dark] (Default: All variants)"
   printf "  %-25s%s\n" "-a, --alt VARIANTS" "Specify theme titilebutton variant(s) [standard|alt] (Default: All variants)"
+  printf "  %-25s%s\n" "-s, --size VARIANTS" "Run a dialg to change the nautilus sidebar width size (Default: 200px)"
   printf "  %-25s%s\n" "-i, --icon VARIANTS" "Specify activities icon variant(s) for gnome-shell [standard|normal|gnome|ubuntu|arch|manjaro|fedora|debian|void] (Default: standard variant)"
   printf "  %-25s%s\n" "-g, --gdm" "Install GDM theme, this option need root user authority! please run this with sudo"
   printf "  %-25s%s\n" "-r, --revert" "revert GDM theme, this option need root user authority! please run this with sudo"