diff --git a/lib/atc/README b/lib/atc/README
index 1d59d99b3f..8784e6a90a 100644
--- a/lib/atc/README
+++ b/lib/atc/README
@@ -1,6 +1,7 @@
 ATC (Atom To Continuum methods)
 
-Reese Jones, Jeremy Templeton, Jonathan Zimmerman 
+Reese Jones, Jeremy Templeton, Jonathan Zimmerman (Sandia National Labs)
+rjones, jatempl, jzimmer at sandia.gov
 September 2009
 
 --------------
@@ -9,17 +10,20 @@ This is version 1.0 of the ATC library, which provides continuum field
 estimation and molecular dynamics-finite element coupling methods.
 
 This library must be built with a C++ compiler, before LAMMPS is
-built, so LAMMPS can link against it. This library is dependent on the
-system libraries MPI, BLAS and LAPACK which will be linked when LAMMPS
-is built.
+built, so LAMMPS can link against it.
 
 Build the library using one of the provided Makefiles or creating your
 own, specific to your compiler and system.  For example:
 
 make -f Makefile.g++
 
-Note that the ATC library makes MPI calls, so you should
-build it with the same MPI library that is used to build
-LAMMPS, e.g. in the lammps/src/MAKE/Makefile.foo file.
+Note that the ATC library makes MPI calls, so you must build it with
+the same MPI library that is used to build LAMMPS, e.g. as specified
+by settings in the lammps/src/MAKE/Makefile.foo file.
 
 If the build is successful, you should end up with a libatc.a file.
+
+When you build LAMMPS with this library, you must insure that the
+settings in the lo-level Makefile (in lammps/src/MAKE) are correct for
+user-atc-SYSLIB and user-atc_SYSLIBPATH, so the the appropriate BLAS
+and LAPACK libraries on your system can be linked against.