diff --git a/griddle b/griddle
index df87fe9..93e248b 100755
--- a/griddle
+++ b/griddle
@@ -20,12 +20,22 @@ generate_lines() {
 	width="$3"
 	height="$4"
 
+	# Generate border lines
+	border_width=$((width - 1))
+	border_height=$((height - 1))
+	printf "line 0, 0 0, %d " $border_height
+	printf "line 0, 0 %d, 0 " $border_width
+	printf "line 0, %d %d, %d " $border_height $border_width $border_height
+	printf "line %d, 0 %d, %d " $border_width $border_width $border_height
+
+	# Generate column separators
 	colwidth=$((width / columns))
 	for i in $(seq 0 $columns); do
 		current_colwidth=$((colwidth * i))
 		printf "line %d, 0 %d, %d " $current_colwidth $current_colwidth $height 
 	done
 
+	# Generate row separators
 	rowheight=$((height / rows))
 	for i in $(seq 0 $rows); do
 		current_rowheight=$((rowheight * i))