diff --git a/lib/superfox/sfrx_sub.f90 b/lib/superfox/sfrx_sub.f90
index 08047989f..12a48e088 100644
--- a/lib/superfox/sfrx_sub.f90
+++ b/lib/superfox/sfrx_sub.f90
@@ -36,7 +36,7 @@ subroutine sfrx_sub(nyymmdd,nutc,nfqso,ntol,iwave)
 
   call sfox_ana(dd,npts,c0,npts)
 
-!  call sfox_remove_tone(c0,fsync)  ! Needs testing
+  call sfox_remove_tone(c0,fsync)  ! Needs testing
 
   ndepth=3
   dth=0.5