insmod: clarify module_name / file_name distinction

1 files changed, 9 insertions, 1 deletions

diff --git a/modutils/insmod.c b/modutils/insmod.c
index 61ee5009b..4d211f50c 100644
--- a/modutils/insmod.c
+++ b/modutils/insmod.c
@@ -16,9 +16,17 @@ int insmod_main(int argc UNUSED_PARAM, char **argv)
         char *filename;
         int rc;
 
+        /* Compat note:
+         * 2.6 style insmod has no options and required filename
+         * (not module name - .ko can't be omitted).
+         * 2.4 style insmod can take module name without .ko
+         * and performs module search in default directories
+         * or in $MODPATH.
+         */
+
         USE_FEATURE_2_4_MODULES(
                 getopt32(argv, INSMOD_OPTS INSMOD_ARGS);
-                argv += optind-1;
+                argv += optind - 1;
         );
 
         filename = *++argv;