Update README.md

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Wohlstand · Nov 12, 2018 · ef9c658 · ef9c658
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@@ -15,6 +15,7 @@ Linux | Windows | macOS
 * Apogee Sound System timbre formats (.TMB) ([Specification](http://www.shikadi.net/moddingwiki/Apogee_Sound_System_Timbre_Format))
 * SoundBlaster IBK files (.IBK) ([Specification](http://www.shikadi.net/moddingwiki/IBK_Format))
 * AdLib/HMI BNK files (.BNK) ([Specification](http://www.shikadi.net/moddingwiki/AdLib_Instrument_Bank_Format))
+* Adlib Gold files (.BNK) (specification is informal and can only be retrieved from source code)
 * AdLib Timbre bank files (.SND, .TIM) ([Specification](http://www.shikadi.net/moddingwiki/AdLib_Timbre_Bank_Format))
 * Global Timbre Library files for Audio Interface Library (.AD, .OPL) ([Specification](http://www.shikadi.net/moddingwiki/Global_Timbre_Library))
 * SB and O3 bank formats (a set of the concatenated SBI files) used with Linux drivers