diff --git a/elements/neuron/presynapse.md b/elements/neuron/presynapse.md
index 886b407..6f654a5 100644
--- a/elements/neuron/presynapse.md
+++ b/elements/neuron/presynapse.md
@@ -5,7 +5,8 @@ include_toc: true
 # presynapse.md
 
 Modulation:
-- is developed by: [AXON](axon.md) 
+- is developed by: [AXON](axon.md)
+- is tuned by: ORGANISM, organs, modules
 - tunes:[VGCC_PRE](#vgcc-pre) 
 
 Qui comprendiamo:
@@ -417,6 +418,10 @@ PossibleDownPreVgccTun
 
 ## VGCC-PRE
 
+Modulation:
+- is tuned by:[PRESYNAPSE](#presynapse) 
+
+
 Voltage-Controlled Gated Channels: Qui per ora non gestiamo l'evoluzione della depolarizzazione. Alla scomparsa dell'AP, i VGCC smettono di funzionare.
 
 ```Gen