diff --git a/Customizations/LayerDefinition.ts b/Customizations/LayerDefinition.ts
index 03822e3fd..14f9b401b 100644
--- a/Customizations/LayerDefinition.ts
+++ b/Customizations/LayerDefinition.ts
@@ -16,9 +16,35 @@ export class LayerDefinition {
      * This name is shown in the 'add XXX button'
      */
     name: string;
+    /**
+     * These tags are added whenever a new point is added by the user on the map.
+     * This is the ideal place to add extra info, such as "fixme=added by MapComplete, geometry should be checked"
+     */
     newElementTags: Tag[]
+    /**
+     * Not really used anymore
+     * This is meant to serve as icon in the buttons
+     */
     icon: string;
+    /**
+     * Only show this layer starting at this zoom level
+     */
     minzoom: number;
+
+    /**
+     * This tagfilter is used to query overpass.
+     * Examples are:
+     * 
+     * new Tag("amenity","drinking_water")
+     * 
+     * or a query for bicycle pumps which have two tagging schemes:
+     * new Or([ 
+     *  new Tag("service:bicycle:pump","yes") ,
+     *  new And([
+     *      new Tag("amenity","compressed_air"), 
+     *      new Tag("bicycle","yes")])
+     *  ])
+     */
     overpassFilter: TagsFilter;
 
     /**
diff --git a/Customizations/Layout.ts b/Customizations/Layout.ts
index 7a5b8809e..7c7292790 100644
--- a/Customizations/Layout.ts
+++ b/Customizations/Layout.ts
@@ -17,7 +17,20 @@ export class Layout {
     public welcomeTail: string;
 
     public locationContains: string[];
-    
+
+    /**
+     * 
+     * @param name: The name used in the query string. If in the query "quests=<name>" is defined, it will select this layout
+     * @param title: Will be used in the <title> of the page
+     * @param layers: The layers to show, a list of LayerDefinitions
+     * @param startzoom: The initial starting zoom of the map
+     * @param startLat:The initial starting latitude of the map
+     * @param startLon: the initial starting longitude of the map
+     * @param welcomeMessage: This message is shown in the collapsable box on the left
+     * @param gettingStartedPlzLogin: This is shown below the welcomemessage and wrapped in a login link.
+     * @param welcomeBackMessage: This is shown when the user is logged in
+     * @param welcomeTail: This text is shown below the login message. It is ideal for extra help
+     */
     constructor(
         name: string,
         title: string,
@@ -26,8 +39,8 @@ export class Layout {
         startLat: number,
         startLon: number,
         welcomeMessage: string,
-        gettingStartedPlzLogin: string,
-        welcomeBackMessage: string,
+        gettingStartedPlzLogin: string = "Please login to get started",
+        welcomeBackMessage: string = "You are logged in. Welcome back!",
         welcomeTail: string = ""
     ) {
         this.title = title;