diff --git a/include/oemcommands.hpp b/include/oemcommands.hpp
index a382716..a6ece9c 100644
--- a/include/oemcommands.hpp
+++ b/include/oemcommands.hpp
@@ -52,6 +52,7 @@
 static constexpr Cmd cmdSetShutdownPolicy = 0x60;
 static constexpr Cmd cmdGetShutdownPolicy = 0x62;
 static constexpr Cmd cmdGetMultiNodePresence = 0x63;
+static constexpr Cmd cmdGetBufferSize = 0x66;
 static constexpr Cmd cmdSetFanConfig = 0x89;
 static constexpr Cmd cmdGetFanConfig = 0x8a;
 static constexpr Cmd cmdSetFanSpeedOffset = 0x8c;