diff --git a/elements/neuron/axon.md b/elements/neuron/axon.md
index 80363b6..304ab1f 100644
--- a/elements/neuron/axon.md
+++ b/elements/neuron/axon.md
@@ -19,6 +19,6 @@ AXON
   type: comprehension
 
   expansion:
-    _presynapse: TUB [ comprehension: PRESYNAPSE, full: 50x, active: 0x, empty: 10x ]
+    _@presynapse: TUB [ comprehension: PRESYNAPSE, full: 50x, active: 0x, empty: 10x ]
     # managed_by: EXCITATION or INHIBITION from winnertakeall
 ```