1 files changed, 6 insertions, 1 deletions
diff --git a/tools/h5debug.c b/tools/h5debug.c
index c2364a1..ff6b5fe 100644
--- a/tools/h5debug.c
+++ b/tools/h5debug.c
@@ -27,7 +27,6 @@
 /* File drivers */
 #include <H5FDfamily.h>
 
-
 #define INDENT  3
 #define VCOL    50
 
@@ -59,6 +58,12 @@ main(int argc, char *argv[])
     intn        i, ndims;
     herr_t      status = SUCCEED;
 
+    if (argc == 1) {
+	fprintf(stderr,
+		"Usage: %s filename [signature addr [extra]]\n", argv[0]);
+	HDexit(1);
+    }
+
     /*
      * Open the file and get the file descriptor.
      */