diff --git a/README.md b/README.md
index 709a578..420b895 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ This project consists of an Information System for a Medical Institution.
  
 ## Installation
 
-1. Install Nix (compatible with Nix and Linux):
+1. Install Nix (compatible with MacOS and Linux):
 
 ``` {.shell}
 curl -L https://nixos.org/nix/install | sh
diff --git a/src/change_input_type.js b/src/change_input_type.js
index 72aad06..ef111f7 100644
--- a/src/change_input_type.js
+++ b/src/change_input_type.js
@@ -2,16 +2,18 @@ function changeInputType() {
     country = document.getElementById("pais").value;
     region = document.getElementById("provincia");
     city = document.getElementById("localidad");
+    region_input = document.getElementById("provincia2");
+    city_input = document.getElementById("localidad2");
 
     if (country == 73) {
         region.hidden = false;
         city.hidden = false;
+        region_input.type = "hidden";
+        city_input.type = "hidden";
     } else {
         region.hidden = true;
         city.hidden = true;
-        region_input = document.getElementById("provincia2");
-        city_input = document.getElementById("localidad2");
         region_input.type = "text";
         city_input.type = "text";
     }
-}
\ No newline at end of file
+}