diff --git a/applications/lofar1/pfs/hdllib.cfg b/applications/lofar1/pfs/hdllib.cfg
index 1b731b60a2f4c964f65abf55b6f26644635bcf42..3023ef367fefd7adf4079cc9afaf0895daa418eb 100644
--- a/applications/lofar1/pfs/hdllib.cfg
+++ b/applications/lofar1/pfs/hdllib.cfg
@@ -18,6 +18,6 @@ regression_test_vhdl =
     
 [modelsim_project_file]
 modelsim_copy_files =
-    src/data           data
+    src/data           data    # PFIR filter coefficients
 
 [ise_project_file]
diff --git a/applications/lofar1/pft2/hdllib.cfg b/applications/lofar1/pft2/hdllib.cfg
index b26cec4dbdd7005fdf6591d415d3ab0dc9ced680..c368373cc78db3ab57e4627789272eda4349a504 100644
--- a/applications/lofar1/pft2/hdllib.cfg
+++ b/applications/lofar1/pft2/hdllib.cfg
@@ -27,6 +27,7 @@ regression_test_vhdl =
     
 [modelsim_project_file]
 modelsim_copy_files =
-    tb/data           data
+    src/data          data    # twiddle factors
+    tb/data           data    # tb stimuli and results
 
 [ise_project_file]