diff --git a/m4a2wav b/m4a2wav
index 2399d33..4e5ed24 100755
--- a/m4a2wav
+++ b/m4a2wav
@@ -1,3 +1,15 @@
 #!/bin/sh
 
+usage() {
+	echo <<EOF
+m4a2wav
+
+Usage:
+	m4a2wav
+
+Converts all m4a files in the current directory to
+wav format. Requires ffmpeg.
+EOF
+}
+
 fd -e m4a -x ffmpeg -i {} {.}.wav
\ No newline at end of file