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-rw-r--r--man/manpage.template11
1 files changed, 11 insertions, 0 deletions
diff --git a/man/manpage.template b/man/manpage.template
index 052ccb63..41f06dc0 100644
--- a/man/manpage.template
+++ b/man/manpage.template
@@ -28,6 +28,17 @@ specifies a PC speaker driver to use for sound effect playback. Valid
options are "Linux" for the Linux console mode driver, "BSD" for the
NetBSD/OpenBSD PC speaker driver, and "SDL" for SDL-based emulated PC speaker
playback (using the digital output).
+.TP
+\fBOPL_DRIVER\fR
+When using OPL MIDI playback, this environment variable specifies an
+OPL backend driver to use. Valid options are "SDL" for an SDL-based
+software emulated OPL chip, "Linux" for the Linux hardware OPL driver,
+and "OpenBSD" for the OpenBSD/NetBSD hardware OPL driver.
+
+Generally speaking, a real hardware OPL chip sounds better than software
+emulation; however, modern machines do not often include one. If
+present, it may still require extra work to set up and elevated
+security privileges to access.
.SH FILES
.TP
\fB$HOME/.chocolate-doom/default.cfg\fR