Name of feature should probably be the top-level heading.
Describe the feature – provide a general overview
What had to happen before someone reaches this page, e.g., user must be logged in and have certain authorization privileges.
Link to earlier feature as appropriate, so that we can easily reference the requirements for that feature.
Describe what a user sees: what are the input fields, what are the results displayed, what order are they in
Describe the options for what a user can do. Be specific. (May be tied with fields in earlier section.)
What is required of the user? Any input that needs to validated? Any constraints? (Perhaps a user must fill in two fields or only one of two fields.)
When a user enters input or clicks a button, what are the possible outcomes?
Examples: if user enters erroneous input, what happens? if user does one of three options, what happens in each of those cases?
Describe some typical situations of what a user can/will do.
May want to put this earlier, but may not make sense unless you explain the other stuff.
Relative priority of feature (high, medium, low)