diff --git a/elements/neuron/axon.md b/elements/neuron/axon.md
index 8efa7a7..b42b291 100644
--- a/elements/neuron/axon.md
+++ b/elements/neuron/axon.md
@@ -5,6 +5,7 @@ Qui comprendiamo:
 - AXON: Axon
 
 ## AXON: Container
+[Click here to read the contributing guide](Presynapse.md)
 The axon does not contain specific behavior.
 - We might add balancing of ATP within PRE later. Here we comprehend it as a “cable” transporting the AP from SOMA to Presynapse. It expands PRESYNAPSE which:
 - l'equivalente del tuning della PRESYNAPSE, come espansione dell'AXON, e' fatta da excitation/inhibition in winnertakeall. Per equivalente si intende che e' uno spostare PRESYNAPSE da actual, come se fosse un tuning.