diff --git a/elements/neuron/presynapse.md b/elements/neuron/presynapse.md
index fe3b878..56238c4 100644
--- a/elements/neuron/presynapse.md
+++ b/elements/neuron/presynapse.md
@@ -5,13 +5,15 @@ include_toc: true
 # presynapse.md
 
 Modulation:
+
 - is developed by: [AXON](axon.md)
 - is tuned by: ORGANISM, organs, modules
 - tunes: [VGCC_PRE](#vgcc-pre) 
 
 Qui comprendiamo:
 
-- PRESYNAPSE: Presynapse
+- [PRESYNAPSE](#presynapse)
+- [VCGG](#vgcc_pre)
 - VGCC_PRE: Voltage-Controlled Gated Channels
 
 ## PRESYNAPSE