diff --git a/tools/style/shortcuts.sty b/tools/style/shortcuts.sty
index 2cad935..4ab9532 100755
--- a/tools/style/shortcuts.sty
+++ b/tools/style/shortcuts.sty
@@ -121,6 +121,9 @@
     \IfEqCase{#1}{%
         {}{%
         }
+        {e}{%
+            \EmptySignalBar
+        }
         {3}{%
             \EmptySignalBar
             \filldraw[fill=green] (0, 0) rectangle ++(0.8, 1);