diff --git a/doc/introduction.dox b/doc/introduction.dox
index 692a490cbf..fbdee54709 100644
--- a/doc/introduction.dox
+++ b/doc/introduction.dox
@@ -74,7 +74,7 @@ Structure and dynamics modeling in \imp proceeds in a five stage iterative proce
     - how close a distance is to the measured value: IMP::core::DistanceRestraint
     - how well the model fits a density map: IMP::em::FitRestraint
     - how close the volume of a molecule is to the expected value: IMP::core::VolumeRestraint
-    - excluded volume: IMP::core::ExcludedVolumeRestraint
+    - excluded volume (steric clash): IMP::core::ExcludedVolumeRestraint
     - connectivity of a subcomplex: IMP::core::ConnectivityRestraint
     - the fit of the SAXS cure of a complex to a measured one: IMP::saxs::Restraint
     - statistical potentials: IMP::atom::ProteinLigandRestraint
diff --git a/modules/core/include/ExcludedVolumeRestraint.h b/modules/core/include/ExcludedVolumeRestraint.h
index 542eff2e12..ea4bf6d630 100644
--- a/modules/core/include/ExcludedVolumeRestraint.h
+++ b/modules/core/include/ExcludedVolumeRestraint.h
@@ -24,7 +24,8 @@ IMPCORE_BEGIN_NAMESPACE
 
 //! Prevent a set of particles and rigid bodies from inter-penetrating
 /** Given an arbitrary collection of particles and rigid bodies, this
-    restraint prevents the particles from interpenetrating.
+    restraint prevents the particles from interpenetrating. Such restraints
+    are also known as steric clash restraints.
 
     If any of the rigid bodies don't have radii, an appropriate radius
     will be added. Note, to take advantage of this, the RigidBody