diff --git a/code/mpie_cpfem_abaqus.f90 b/code/mpie_cpfem_abaqus.f
similarity index 99%
rename from code/mpie_cpfem_abaqus.f90
rename to code/mpie_cpfem_abaqus.f
index b05b70489..d82e1f4bb 100644
--- a/code/mpie_cpfem_abaqus.f90
+++ b/code/mpie_cpfem_abaqus.f
@@ -8,6 +8,10 @@
 !
 ! MPI fuer Eisenforschung, Duesseldorf
 ! PSI, Switzerland
+!
+! REMARK: change compile command to include the switch
+!         "-free" in "abaqus_v6.env"
+!
 !********************************************************************
 
 MODULE cpfem_interface