diff --git a/tools/reax/README.txt b/tools/reax/README.txt
index 9f3499ca2..83ae92a2d 100644
--- a/tools/reax/README.txt
+++ b/tools/reax/README.txt
@@ -1,11 +1,13 @@
 === ReaxFF tools ===
 ===============================
 
 The programs in this folder can be used to analyze the
 output of simulations using the ReaxFF potentials;
 
-mol_fra.c: analyzes the output of fix reax/bonds. 
+mol_fra.c: analyzes the output of fix reax/bonds
+   Compile it using a C compiler
+   To test, run it with Cutoff.dic and bonds.reax
    Contact: Aidan Thompson
 
 bondConnectCheck.f90: analyzes the output of fix reax/bonds.
    Contact: Paul Liangliang Huang <lhuang4@ncsu.edu>