diff --git a/doc/sdcard.txt b/doc/sdcard.txt
new file mode 100644
index 0000000..323056e
--- /dev/null
+++ b/doc/sdcard.txt
@@ -0,0 +1,3 @@
+SD slide-in-slide-out
+Ordered part: 
+ALPS SCHD3A0100
\ No newline at end of file