diff --git a/public/paysagerenderer/visibility_management.js b/public/paysagerenderer/visibility_management.js
index 2f5ea8f..9fa6ba2 100644
--- a/public/paysagerenderer/visibility_management.js
+++ b/public/paysagerenderer/visibility_management.js
@@ -1,11 +1,16 @@
 /* eslint no-eval: "off" */
 var Paysage = window.Paysage || {};
 
+const ONLY_COMMAND = '#only=';
+
 Paysage.readIdsFromUrlHash = function (urlHash) {
-  if (urlHash.length <= 1) {
-    return undefined;
+  if (urlHash.startsWith(ONLY_COMMAND)) {
+    return urlHash.substring(ONLY_COMMAND.length).split(',');
+  }
+  if (urlHash === "#none") {
+    return [];
   }
-  return urlHash.substring(1).split(',');
+  return undefined;
 };
 
 Paysage.showCodeObjects = function (allIds, idsToShow, show, hide) {
diff --git a/spec/public/paysagerenderer/visibility_management_spec.js b/spec/public/paysagerenderer/visibility_management_spec.js
index 951b7a9..59572c7 100644
--- a/spec/public/paysagerenderer/visibility_management_spec.js
+++ b/spec/public/paysagerenderer/visibility_management_spec.js
@@ -4,8 +4,9 @@ describe('The Paysage renderer visibility management', function () {
   it('can parse Url hash for code objects ids to display', function () {
     expect(Paysage.readIdsFromUrlHash('')).toEqual(undefined);
     expect(Paysage.readIdsFromUrlHash('#')).toEqual(undefined);
-    expect(Paysage.readIdsFromUrlHash('#toto')).toEqual(['toto']);
-    expect(Paysage.readIdsFromUrlHash('#toto,titi')).toEqual(['toto', 'titi']);
+    expect(Paysage.readIdsFromUrlHash('#only=toto')).toEqual(['toto']);
+    expect(Paysage.readIdsFromUrlHash('#only=toto,titi')).toEqual(['toto', 'titi']);
+    expect(Paysage.readIdsFromUrlHash('#none')).toEqual([]);
   });
 
   describe('has code object filtering', function () {