diff --git a/tracy/tracy/inc/read_script.h b/tracy/tracy/inc/read_script.h
index 475787122f79ed09481d12c000ef5a2c4ca4b774..ffdb8dcdfc8d733c66bc03db33f8f22c4485b01c 100644
--- a/tracy/tracy/inc/read_script.h
+++ b/tracy/tracy/inc/read_script.h
@@ -161,10 +161,12 @@ strcpy(_EnergyTuneShift_nudp_file,"nudp.out");
  };
 
 /***** file names************/
- //files with multipole errors
+ //files with multipole errors; for soleil lattice
  extern char fic_hcorr[max_str],fic_vcorr[max_str], fic_skew[max_str];
  extern char multipole_file[max_str];
-
+ //file of source of coupling; for soleil lattice
+ extern char virtualskewquad_file[max_str];
+ 
  extern char track_file[max_str];
  extern char twiss_file[max_str];
  extern char cod_file[max_str];