diff --git a/Documentation/btrfstune.txt b/Documentation/btrfstune.txt
index 1309fb6a..bf44bdf7 100644
--- a/Documentation/btrfstune.txt
+++ b/Documentation/btrfstune.txt
@@ -17,8 +17,9 @@ enable/disable some extended features for btrfs.
 OPTIONS
 -------
 -S <value>::
-Updates the seeding value, it forces a fs readonly so that you can use it to
-build other filesystems.
+Updates the seeding value.
+A positive value will enable seeding, zero will disable seeding, negtive is not allowed.
+Enable seeding forces a fs readonly so that you can use it to build other filesystems.
 -r::
 Enable extended inode refs.
 -x::
diff --git a/btrfstune.c b/btrfstune.c
index 2c26fe9b..3f2f0cdc 100644
--- a/btrfstune.c
+++ b/btrfstune.c
@@ -100,9 +100,9 @@ static int enable_skinny_metadata(struct btrfs_root *root)
 static void print_usage(void)
 {
 	fprintf(stderr, "usage: btrfstune [options] device\n");
-	fprintf(stderr, "\t-S value\tenable/disable seeding\n");
+	fprintf(stderr, "\t-S value\tpositive value will enable seeding, zero to disable, negative is not allowed\n");
 	fprintf(stderr, "\t-r \t\tenable extended inode refs\n");
-	fprintf(stderr, "\t-x enable skinny metadata extent refs\n");
+	fprintf(stderr, "\t-x \t\tenable skinny metadata extent refs\n");
 }
 
 int main(int argc, char *argv[])