trajectory property missing in amml docs

The example MD scipt in examples/TextM-examples/EMT_examples-H2andH2O/Langevin_NVT_H2O.vm considers the trajectory property in the line:

prop = Property energy, forces, trajectory ((calculator: calc), (structure: h2o), (algorithm: algo))

However the trajectory property is not described in the documentation's properties table. Should it be added?