Added small explanatory comment

svn-id: r27779

1 files changed, 5 insertions, 1 deletions

diff --git a/sound/rate.cpp b/sound/rate.cpp
index 105b5d5d26..5944e64694 100644
--- a/sound/rate.cpp
+++ b/sound/rate.cpp
@@ -196,7 +196,11 @@ LinearRateConverter<stereo, reverseStereo>::LinearRateConverter(st_rate_t inrate
 
 	opos = FRAC_ONE;
 
-	/* increment */
+	// Compute the linear interpolation increment.
+	// This will overflow if inrate >= 2^16, and underflow if outrate >= 2^16.
+	// Also, if the quotient of the two rate becomes too small / too big, that
+	// would cause problems, but since we rarely scale from 1 to 65536 Hz or vice
+	// versa, I think we can live with that limiation ;-).
 	opos_inc = (inrate << FRAC_BITS) / outrate;
 
 	ilast0 = ilast1 = 0;