Every OSM editor allows you to add [add free-form tags tags](//wiki.openstreetmap.org/wiki/Tags#Use_in_an_editor) that are not in any list. Some OSM editors also allow you to create your own "presets" so that whenever you map a supermarket there will be a field for opening hours. If you're using iD, don't be misled by the fact that there's an attribute list - that's only intended to help but you can always type a free-text attribute. If you are wondering which tag to use for something, consult the wiki [wiki](//wiki.openstreetmap.org) or taginfo.openstreetmap.org [taginfo.openstreetmap.org](http://taginfo.openstreetmap.org) where you can search for keywords.

Every OSM editor allows you to add free-form tags that are not in any list. Some OSM editors also allow you to create your own "presets" so that whenever you map a supermarket there will be a field for opening hours. If you're using iD, don't be misled by the fact that there's a an attribute list - that's only intended to help but you can always type a free-text attribute. If you are wondering which tag to use for something, consult the wiki or taginfo.openstreetmap.org where you can search for keywords.

Every OSM editor allows you to add free-form tags that are not in any list. Some OSM editors also allow you to create your own "presets" so that whenever you map a supermarket there will be a field for opening hours. If you're using iD, don't be misled by the fact that there's a attribute list - that's only intended to help but you can always type a free-text attribute. If you are wondering which tag to use for something, consult the wiki or taginfo.openstreetmap.org where you can search for keywords.