Index: kernel/include/IMP/Restraint.h
===================================================================
--- kernel/include/IMP/Restraint.h	(revision 606)
+++ kernel/include/IMP/Restraint.h	(working copy)
@@ -41,6 +41,9 @@
     constructor and should provide methods so that the set of particles
     can be modified after construction.
 
+    A restraint can be added to the model multiple times or to multiple 
+    restraint sets in the same model.
+
     \note When logging is VERBOSE, restraints should print enough information
     in evaluate to reproduce the the entire flow of data in evaluate. When
     logging is TERSE the restraint should print out only a constant number of