diff --git a/opm/core/newwells.h b/opm/core/newwells.h
index 3e29f058d..3e14fb9b3 100644
--- a/opm/core/newwells.h
+++ b/opm/core/newwells.h
@@ -45,15 +45,16 @@ enum SurfaceComponent { WATER = 0, OIL = 1, GAS = 2 };
 
 
 /** Controls for a single well.
- *  Each control specifies a well rate or bottom hole pressure. Only
+ *  Each control specifies a well rate or bottom-hole pressure. Only
  *  one control can be active at a time, indicated by current. The
  *  meaning of each control's target value depends on the control
  *  type, for BHP controls it is a pressure in Pascal, for RATE
  *  controls it is a volumetric rate in cubic(meter)/second. The
- *  active control should be interpreted as an equation, whereas the
- *  non-active controls should be interpreted as inequalities
- *  specifying constraints on the solution, where BHP controls yield
- *  minimum pressures, and RATE controls yield maximum rates.
+ *  active control as an equality constraint, whereas the
+ *  non-active controls should be interpreted as inequality
+ *  constraints (upper or lower bounds).  For instance, a PRODUCER's BHP
+ *  constraint defines a minimum acceptable bottom-hole pressure value
+ *  for the well.
  */
 struct WellControls
 {