diff --git a/elements/neuron/presynapse.md b/elements/neuron/presynapse.md
index 88c6270..cfe341d 100644
--- a/elements/neuron/presynapse.md
+++ b/elements/neuron/presynapse.md
@@ -34,6 +34,10 @@ PRESYNAPSE
 
     @AXON: EXPAND [ comprehension: AXON ]
 
+    $OUT-EXCI-001: INSTANTIATE [ container: OUT_EXCITATION, argument: COLLECTION [
+      pre: (  @NEU_001.@AXO_001._presynapse, 
+              @NEU_002.@AXO_001._presynapse ) ] ]    
+
     
     !DAY: INTRICATION [ ref: &ORGANISM.!DAY ]
     !NIGHT: INTRICATION [ ref: &ORGANISM.!NIGHT ]