diff --git a/settings/sound.rst b/settings/sound.rst
index 18c9fec..1e71b04 100644
--- a/settings/sound.rst
+++ b/settings/sound.rst
@@ -14,7 +14,7 @@ Sound cards to emulate. Up to 4 different sound cards are supported. Only cards
 
 The *Configure* button opens a new window with settings specific to the selected sound card, such as the I/O ports, IRQ and DMA channels for ISA cards.
 
-Emulation for the Yamaha OPL series of synthesizers (used by many of the emulated cards) is provided by a modified `Nuked OPL3 <https://github.com/nukeykt/Nuked-OPL3>`_ or `ymfm <https://github.com/aaronsgiles/ymfm>`_ library, per the :ref:`selection below <settings/sound:FM synth driver>`.
+Emulation for the Yamaha OPL series of synthesizers (used by many of the emulated cards) is provided by a modified `Nuked OPL3 <https://github.com/nukeykt/Nuked-OPL3>`_ or `ymfm <https://github.com/aaronsgiles/ymfm>`_ library, per the :ref:`selection below <settings/sound:FM synth driver>`. MOS Technology 6581 SID emulation for the Innovation SSI-2001 is provided by the reSIDfp component of the `libsidplayfp <https://github.com/libsidplayfp/libsidplayfp>`_ library.
 
 .. note:: The **Innovation SSI-2001**, **CMS / Game Blaster** and **Gravis Ultrasound** are now selectable here, replacing the previous separate options for each.