diff --git a/static/js/map.js b/static/js/map.js
index 4747cf1..151c31a 100644
--- a/static/js/map.js
+++ b/static/js/map.js
@@ -168,6 +168,16 @@ function isa_only(e) {
   checkbox_change();
 }
 
+function show_all_isa(e) {
+  e.preventDefault();
+  var checkbox_list = document.getElementsByClassName('isa-checkbox');
+  for (const checkbox of checkbox_list) {
+    checkbox.checked = true;
+  }
+
+  checkbox_change();
+}
+
 function checkbox_change() {
   var checkbox_list = document.getElementsByClassName('isa-checkbox');
   var ticked = [];
@@ -350,6 +360,8 @@ function load_wikidata_items() {
 
 };
 
+document.getElementById('show-all-isa').onclick = show_all_isa;
+
 var load_btn = document.getElementById('load-btn');
 load_btn.onclick = load_wikidata_items;
 
diff --git a/templates/map.html b/templates/map.html
index e538b78..805210f 100644
--- a/templates/map.html
+++ b/templates/map.html
@@ -29,6 +29,7 @@
       <div class="card bg-white visually-hidden mt-3" id="isa-card">
         <div class="card-body">
           <div class="h5 card-title">item types</div>
+          <div><a href="#" id="show-all-isa">show all</a></div>
           <div id="isa-list">
           </div>
         </div>