diff --git a/src/network.rs b/src/network.rs
index 03d132e..17cc62b 100644
--- a/src/network.rs
+++ b/src/network.rs
@@ -1,20 +1,29 @@
 use thiserror::Error;
 use crate::params;
-use ndarray::prelude::*;
 use crate::node;
 
+/// Error types for trait Network
 #[derive(Error, Debug)]
 pub enum NetworkError {
     #[error("Error during node insertion")]
     NodeInsertionError(String)
 }
 
+
+///Network
+///The Network trait define the required methods for a structure used as pgm (such as ctbn).
 pub trait Network {
     fn initialize_adj_matrix(&mut self);
     fn add_node(&mut self, n:  node::Node) -> Result<usize, NetworkError>;
     fn add_edge(&mut self, parent: usize, child: usize);
+
+    ///Get all the indices of the nodes contained inside the network
     fn get_node_indices(&self) -> std::ops::Range<usize>;
     fn get_node(&self, node_idx: usize) -> &node::Node;
+
+    ///Compute the index that must be used to access the parameter of a node given a specific
+    ///configuration of the network. Usually, the only values really used in *current_state* are
+    ///the ones in the parent set of the *node*.
     fn get_param_index_network(&self, node: usize, current_state: &Vec<params::StateType>) -> usize;
     fn get_parent_set(&self, node: usize) -> Vec<usize>;
     fn get_children_set(&self, node: usize) -> Vec<usize>;