diff --git a/neuron/soma.md b/neuron/soma.md
index ba6ab79..4724d9a 100644
--- a/neuron/soma.md
+++ b/neuron/soma.md
@@ -47,7 +47,7 @@ Qui comprendiamo:
 
 - **bAP**:
 
-- **Ca2+**: Medium term traces to guide tuning and Night development
+- **Ca2+**: Medium term traces to guide tuning and Night development. It is a local trace, ATP is a global (Astrocyte)
 
 - **SpikeTrainTraces**: sono le tracce che consentono al neurone di far partire il Tuning neuronale, quando e' lontano da uno spike-train, ovvero e' in riposo.