Em validation q tip
From LimeSurvey Manual
Tip for whole question validation equation (em_validation_q_tip)
If you are using the question validation equation, you can use this box in order to display an optional message as question tip on how the question has to be filled out.
- Any string or equation that makes use of the ExpressionScript syntax.
See the example from the question validation equation wiki section- it shows how the tip can be tailored to show which parts of a multiple short text question fail the validation criteria.