diff --git a/aiAlu.circ b/aiAlu.circ
index de4ef89..94abd10 100644
--- a/aiAlu.circ
+++ b/aiAlu.circ
@@ -68,6 +68,14 @@ This file is intended to be loaded by Logisim (http://www.cburch.com/logisim/).
     <a name="clabel" val=""/>
     <a name="clabelup" val="east"/>
     <a name="clabelfont" val="SansSerif plain 12"/>
+    <appear>
+      <path d="M65,54 Q70,67 74,57" fill="none" stroke="#808080" stroke-width="2"/>
+      <polygon fill="none" points="50,50 90,60 90,80 50,90" stroke="#000000" stroke-width="2"/>
+      <circ-port height="8" pin="50,30" width="8" x="46" y="56"/>
+      <circ-port height="8" pin="50,70" width="8" x="46" y="76"/>
+      <circ-port height="10" pin="430,130" width="10" x="85" y="65"/>
+      <circ-anchor facing="east" height="6" width="6" x="87" y="67"/>
+    </appear>
     <wire from="(70,200)" to="(260,200)"/>
     <wire from="(70,80)" to="(260,80)"/>
     <wire from="(50,30)" to="(170,30)"/>
@@ -179,6 +187,17 @@ This file is intended to be loaded by Logisim (http://www.cburch.com/logisim/).
     <a name="clabel" val=""/>
     <a name="clabelup" val="east"/>
     <a name="clabelfont" val="SansSerif plain 12"/>
+    <appear>
+      <path d="M61,56 Q65,66 69,56" fill="none" stroke="#808080" stroke-width="2"/>
+      <rect fill="none" height="30" stroke="#000000" stroke-width="2" width="30" x="50" y="55"/>
+      <polygon fill="#c9c9c9" points="62,62 62,68 56,68 56,74 62,74 62,80 68,80 68,74 74,74 74,68 68,68 68,62" stroke="none"/>
+      <circ-port height="8" pin="70,60" width="8" x="46" y="56"/>
+      <circ-port height="8" pin="70,100" width="8" x="46" y="66"/>
+      <circ-port height="8" pin="70,140" width="8" x="46" y="76"/>
+      <circ-port height="10" pin="430,80" width="10" x="75" y="55"/>
+      <circ-port height="10" pin="430,270" width="10" x="75" y="75"/>
+      <circ-anchor facing="east" height="6" width="6" x="77" y="57"/>
+    </appear>
     <wire from="(80,60)" to="(80,190)"/>
     <wire from="(90,100)" to="(90,230)"/>
     <wire from="(80,190)" to="(140,190)"/>