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-rw-r--r--tools/src/h5diff/h5diff_common.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/src/h5diff/h5diff_common.c b/tools/src/h5diff/h5diff_common.c
index 6248cd5..5ae2a37 100644
--- a/tools/src/h5diff/h5diff_common.c
+++ b/tools/src/h5diff/h5diff_common.c
@@ -640,6 +640,13 @@ usage(void)
PRINTVALSTREAM(rawoutstream,
" --vol-info-2 VOL-specific info to pass to the VOL connector used for\n");
PRINTVALSTREAM(rawoutstream, " opening the second HDF5 file specified\n");
+ PRINTVALSTREAM(rawoutstream, " If none of the above options are used to "
+ "specify a VOL for a file, then\n");
+ PRINTVALSTREAM(
+ rawoutstream,
+ " the VOL named by HDF5_VOL_CONNECTOR (or the native VOL connector,\n");
+ PRINTVALSTREAM(rawoutstream,
+ " if that environment variable is unset) will be used\n");
PRINTVALSTREAM(rawoutstream,
" --vfd-value-1 Value (ID) of the VFL driver to use for opening the\n");
PRINTVALSTREAM(rawoutstream, " first HDF5 file specified\n");