diff --git a/matlab/one_pfb.m b/matlab/one_pfb.m
index c8838d9e952a6714f9c2e0b16b06ae5c0e8b6139..80bd7dc07a9dd35d9d7674e6b0bc3785b7daa038 100644
--- a/matlab/one_pfb.m
+++ b/matlab/one_pfb.m
@@ -29,9 +29,13 @@
 %    . PFIR coeffcients:                      one_pfb_m_pfir_coeff_fircls1_16taps_128points_16b.dat
 %    . PFIR coeffcients, WG, PFIR, PFFT data: one_pfb_m_chirp_8b_16taps_128points_16b_16b.dat
 %
+% References:
+%
 % Description :
+% [1] Multirate Digital Signal Processing (Crochiere)
 %
 % * General
+%   Section 7 in [1] describes a poly phase filterbank (PFB).
 %   The data path (DP) is modelled per block of data. The block of data
 %   are counted by the block sequence number that thus acts as a
 %   timestamp. The data path consist of DSP functions. Each DSP