Key:opening hours:description

opening_hours:description=* is a compound key consisting of:

   opening_hours=*: When a specific feature of an entity is open edit
   *:description=*: To provide additional information about the related element to the end map user.

Use as an auxiliary to opening_hours=* to give more details to the opening hours. You can also specify the language (i.e. "opening_hours:description:en=Open on appointment only"