src/spectral/mfcc.h: add link to reference implementation

diff --git a/src/spectral/mfcc.h b/src/spectral/mfcc.h
index 6527d44..552d141 100644 (file)
--- a/src/spectral/mfcc.h
+++ b/src/spectral/mfcc.h
@@ -21,7 +21,14 @@
 
 /** \file
 
-  Mel-frequency cepstrum coefficients object
+  Mel-Frequency Cepstrum Coefficients object
+
+  This object computes MFCC coefficients on an input cvec_t.
+
+  The implementation follows the specifications established by Malcolm Slaney
+  in its Auditory Toolbox, available online (see file mfcc.m).
+
+  http://engineering.ecn.purdue.edu/~malcolm/interval/1998-010/
 
   \example spectral/test-mfcc.c