diff --git a/linux/sdcard/write-bytes.sh b/linux/sdcard/write-bytes.sh
index ba847e876..83a8481e5 100755
--- a/linux/sdcard/write-bytes.sh
+++ b/linux/sdcard/write-bytes.sh
@@ -3,6 +3,15 @@
 # This file writes a bunch of bytes to the flash card based on a text
 # file input with bytes written in hexadecimal.
 
+usage() { echo "Usage: $0 [-zh] [-b <path/to/buildroot>] <device>" 1>&2; exit 1; }
+
+help() {
+    echo "Usage: $0 [OPTIONS] <device>"
+    echo "  -i                          Input text file with hex bytes."
+    echo "  -b <path/to/buildroot>      Output binary file."
+    exit 0;
+}
+
 INPUTFILE=""
 OUTPUTFILE=""