clarify comment about patch_system::read_unknown_gridfn() input format

git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinAnalysis/AHFinderDirect/trunk@568 f88db872-0e4f-0410-b76b-b9085cfa78c5

1 files changed, 3 insertions, 1 deletions

diff --git a/src/patch/patch_system.cc b/src/patch/patch_system.cc
index a0fb84a..a3ec522 100644
--- a/src/patch/patch_system.cc
+++ b/src/patch/patch_system.cc
@@ -1118,7 +1118,9 @@ std::fclose(output_fp);
 // This function reads an unknown-grid gridfn in ASCII format from
 // a named input file.  Comments ('#' in column 1) and blank lines
 // are ignored, otherwise the input format matches that written by
-// print_unknown_gridfn().
+// print_unknown_gridfn(): the first 3 numbers on each line are taken
+// to be dpx, dpy, and the gridfn value; anything else on the line is
+// ignored.
 //
 void patch_system::read_unknown_gridfn(bool ghosted_flag, int unknown_gfn,
 				       const char input_file_name[],