diff --git a/README.org b/README.org
index 25b110c..c98a4a5 100644
--- a/README.org
+++ b/README.org
@@ -249,7 +249,7 @@ Why =<insert>=? Because:
 
 So preempting =<insert>= does not sacrifices anything.
 
-* Arrows glyphs =▷ ▶ → ▹ ▸=
+* Arrows glyphs =▷ ▶ → ▹ ▸ ↔=
 At any time, an arrow may be drawn. The arrow points in the direction
 that the line drawing follows.