diff --git a/doc/src/fix_nve.rst b/doc/src/fix_nve.rst
index ae472b1a38..da2184c99f 100644
--- a/doc/src/fix_nve.rst
+++ b/doc/src/fix_nve.rst
@@ -29,10 +29,11 @@ Examples
 Description
 """""""""""
 
-Perform constant NVE integration to update position and velocity for
-atoms in the group each timestep.  V is volume; E is energy.  This
-creates a system trajectory consistent with the microcanonical
-ensemble.
+Perform plain time integration to update position and velocity for
+atoms in the group each timestep.  This creates a system trajectory
+consistent with the microcanonical ensemble (NVE) provided there
+are (full) periodic boundary conditions and no other "manipulations"
+of the system (e.g. fixes that modify forces or velocities).
 
 ----------