diff --git a/potentials/ffield.reax b/potentials/ffield.reax
index cc7f4f729c..cdd52ce3fa 100644
--- a/potentials/ffield.reax
+++ b/potentials/ffield.reax
@@ -1,4 +1,4 @@
-Reactive MD-force field                                                         
+Reactive MD-force field [Strachan et al, JCP 122 054502 (2005).]                
  39       ! Number of general parameters                                        
    50.0000 !Overcoordination parameter                                          
     9.5469 !Overcoordination parameter