diff --git a/wms_usher.sh b/wms_usher.sh
index facb857..2954065 100755
--- a/wms_usher.sh
+++ b/wms_usher.sh
@@ -10,8 +10,8 @@ FW=$(pfw)                      # focused window
 CMW=$(lsw | wc -l)             # count maped windows
 RW=$(wattr w $RID)             # root width
 RH=$(wattr h $RID)             # root height
-SW=$((RW - 2 * BW))              # usable screen width
-SH=$((RH - 2 * BW))              # usable screen height
+SW=$((RW - 2 * BW))            # usable screen width
+SH=$((RH - 2 * BW))            # usable screen height
 
 usage() {
     echo "usage: