diff --git a/optional_requirements.txt b/optional_requirements.txt
index d4e27c4..3f62e00 100644
--- a/optional_requirements.txt
+++ b/optional_requirements.txt
@@ -1,3 +1,5 @@
 # SPDX-FileCopyrightText: 2022 Alec Delaney, for Adafruit Industries
 #
 # SPDX-License-Identifier: Unlicense
+
+adafruit-circuitpython-sd