1 files changed, 2 insertions, 1 deletions

diff --git a/applets/usage.c b/applets/usage.c
index a919a58f7..bab6d21b3 100644
--- a/applets/usage.c
+++ b/applets/usage.c
@@ -161,7 +161,7 @@ const char dc_usage[] =
 
 #if defined BB_DD
 const char dd_usage[] =
-        "dd [if=FILE] [of=FILE] [bs=N] [count=N] [skip=N] [seek=N]\n"
+        "dd [if=FILE] [of=FILE] [bs=N] [count=N] [skip=N] [seek=N] [conv=notrunc|sync]\n"
 #ifndef BB_FEATURE_TRIVIAL_HELP
         "\nCopy a file, converting and formatting according to options\n\n"
         "\tif=FILE\tread from FILE instead of stdin\n"
@@ -171,6 +171,7 @@ const char dd_usage[] =
         "\tskip=N\tskip N input blocks\n"
         "\tseek=N\tskip N output blocks\n"
         "\tconv=notrunc\t dont truncate of at end of write\n"
+        "\tconv=sync\t pad the last block with zeros until blocksize\n"
         "\n"
         "Numbers may be suffixed by w (x2), k (x1024), b (x512), or M (x1024^2)\n"
 #endif