diff --git a/src/main.rs b/src/main.rs
index 181076c..5c8df97 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,6 +7,11 @@ use std::fs::File;
 struct Dictionary {
     words: Vec<String>,
 }
+
+fn line_to_word(l: String) -> String {
+    return l.to_lowercase()
+}
+
 fn main() {
     let args: Vec<String> = env::args().collect();
     let fname = &args[1];
@@ -18,7 +23,7 @@ fn main() {
     for line in buf.lines() {
         let line = line.unwrap();
         // TODO: normalizza: lascia solo a-z, converti gli accenti, ecc.
-        w.push(line.to_string())
+        w.push(line_to_word(line))
     } 
 
     let d = Dictionary{words: w};