diff --git a/display.sh b/display.sh
index d641147..3463146 100755
--- a/display.sh
+++ b/display.sh
@@ -1,7 +1,6 @@
 #!/bin/sh
 
 # stateful script to manage dual monitor setups
-# c
 
 read_cfg() {
   if [ -f ~/.config/xrandr ]; then
@@ -10,9 +9,6 @@ read_cfg() {
   if [ -z "${PRIMARY_MONITOR}" ]; then
     PRIMARY_MONITOR=$(get_default_monitor)
   fi
-  if [ -z "${SECONDARY_MONITOR}" ]; then
-    SECONDARY_MONITOR=$(get_default_monitor)
-  fi
   if [ -z "${MONITOR_RELATION}" ]; then
     MONITOR_RELATION="solo"
   fi
@@ -30,13 +26,16 @@ get_default_monitor() {
 
 apply_monitor_cfg() {
   xrandr --output ${PRIMARY_MONITOR} --auto --primary
-  if [ ${PRIMARY_MONITOR} != ${SECONDARY_MONITOR} ]; then
+  if [ ! -z "${SECONDARY_MONITOR}" ] && [ "${SECONDARY_MONITOR}" != "${PRIMARY_MONITOR}" ]; then
     case ${MONITOR_RELATION} in
       solo)  
         xrandr --output ${SECONDARY_MONITOR} --off ;;
-      left_of|right_of|above|below)
-        xrandr --output ${SECONDARY_MONITOR} --auto ${MONITOR_RELATION} ${PRIMARY_MONITOR} ;;
+      left-of|right-of|above|below)
+        xrandr --output ${SECONDARY_MONITOR} --auto --${MONITOR_RELATION} ${PRIMARY_MONITOR} ;;
     esac
+  else
+    echo "SECONDARY_MONITOR is not set, or same as PRIMARY_MONITOR:"
+    show_cfg
   fi
 }
 
@@ -50,8 +49,8 @@ helpme() {
   printf "    relation: set monitor relation\n"
   printf "    reconfigure: set monitor config based on the relation\n"
   printf "  relations:\n"
-  printf "    solo: disable secondary monitor if different from primary\n"
-  printf "    left_of,right_of,above,below: secondary monitor has named relation to primary\n"
+  printf "    solo: disable secondary monitor\n"
+  printf "    left-of,right-of,above,below: secondary monitor has named relation to primary\n"
 }
 
 read_cfg