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-rw-r--r--audio/fmopl.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/audio/fmopl.h b/audio/fmopl.h
index 323cc3d028..ad1794d873 100644
--- a/audio/fmopl.h
+++ b/audio/fmopl.h
@@ -129,7 +129,9 @@ public:
/**
* Function to directly write to a specific OPL register.
- * This writes to *both* chips for a Dual OPL2.
+ * This writes to *both* chips for a Dual OPL2. We allow
+ * writing to secondary OPL registers by using register
+ * values >= 0x100.
*
* @param r hardware register number to write to
* @param v value, which will be written