diff --git a/src/util/mdb-export.c b/src/util/mdb-export.c
index c7ca9a8..8f6010b 100755
--- a/src/util/mdb-export.c
+++ b/src/util/mdb-export.c
@@ -62,7 +62,7 @@ main(int argc, char **argv)
 		{"escape", 'X', 0, G_OPTION_ARG_STRING, &escape_char, "Use <char> to escape quoted characters within a field. Default is doubling.", "format"},
 		{"namespace", 'N', 0, G_OPTION_ARG_STRING, &namespace, "Prefix identifiers with namespace", "namespace"},
 		{"null", '0', 0, G_OPTION_ARG_STRING, &null_text, "Use <char> to represent a NULL value", "char"},
-		{"bin", 'b', 0, G_OPTION_ARG_STRING, &str_bin_mode, "Binary export mode", "strip|raw|octal"},
+		{"bin", 'b', 0, G_OPTION_ARG_STRING, &str_bin_mode, "Binary export mode", "strip|raw|octal|hex"},
 		{"boolean-words", 'B', 0, G_OPTION_ARG_NONE, &boolean_words, "Use TRUE/FALSE in Boolean fields (default is 0/1)", NULL},
 		{"batch-size", 'S', 0, G_OPTION_ARG_INT, &batch_size, "Size of insert batches on supported platforms.", "int"},
 		{NULL},