diff --git a/src/common/pa_converters.c b/src/common/pa_converters.c
index 97e1274..92daf8f 100644
--- a/src/common/pa_converters.c
+++ b/src/common/pa_converters.c
@@ -45,12 +45,16 @@
 
  @todo Consider whether functions which dither but don't clip should exist,
  V18 automatically enabled clipping whenever dithering was selected. Perhaps
- we should do the same.
+ we should do the same. 
+    see: "require clipping for dithering sample conversion functions?"
+    http://www.portaudio.com/trac/ticket/112
 
  @todo implement the converters marked IMPLEMENT ME: Float32_To_UInt8_Dither,
  Float32_To_UInt8_Clip, Float32_To_UInt8_DitherClip, Int32_To_Int24_Dither,
  Int32_To_UInt8_Dither, Int24_To_Int16_Dither, Int24_To_Int8_Dither, 
- Int24_To_UInt8_Dither, Int16_To_Int8_Dither, Int16_To_UInt8_Dither,
+ Int24_To_UInt8_Dither, Int16_To_Int8_Dither, Int16_To_UInt8_Dither
+    see: "some conversion functions are not implemented in pa_converters.c"
+    http://www.portaudio.com/trac/ticket/35
 
  @todo review the converters marked REVIEW: Float32_To_Int32,
  Float32_To_Int32_Dither, Float32_To_Int32_Clip, Float32_To_Int32_DitherClip,