# Basic Clause Editor

Users can use the basic [ECL](https://confluence.ihtsdotools.org/display/DOCECL) operators and the concept selector dropdown to create a query expression:

![Add a Single Value Set Clause](https://2151851347-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FNmYDYy59u4utCYtlZ8vF%2Fuploads%2FJaKDOziBejEB1NzAc6Ly%2Fvalue_set_add_clause.gif?alt=media)