diff --git a/applications/lofar2/libraries/sdp/src/vhdl/sdp_pkg.vhd b/applications/lofar2/libraries/sdp/src/vhdl/sdp_pkg.vhd
index 5cca1abcb591d47bc17aeea377da0c96df242be8..547b1301ff19305c0f30051aeb7338b251818620 100644
--- a/applications/lofar2/libraries/sdp/src/vhdl/sdp_pkg.vhd
+++ b/applications/lofar2/libraries/sdp/src/vhdl/sdp_pkg.vhd
@@ -219,7 +219,7 @@ PACKAGE sdp_pkg is
   CONSTANT c_sdp_cep_udp_src_port_15_8 : STD_LOGIC_VECTOR(7 DOWNTO 0)  := x"D0";        -- 15:8, 7:0 = gn_id (= ID[7:0] = backplane[5:0] & node[1:0])
 
   CONSTANT c_sdp_cep_nof_blocks_per_packet  : NATURAL := 4;
-  CONSTANT c_sdp_cep_nof_beamlets_per_block : NATURAL := c_sdp_S_sub_bf;   
+  CONSTANT c_sdp_cep_nof_beamlets_per_block : NATURAL := c_sdp_S_sub_bf; -- number of dual pol beamlets (c_sdp_N_pol_bf = 2)  
   CONSTANT c_sdp_cep_nof_hdr_fields : NATURAL := 3+12+4+18+1; -- 592b; 9.25 64b words
   CONSTANT c_sdp_cep_hdr_field_sel  : STD_LOGIC_VECTOR(c_sdp_cep_nof_hdr_fields-1 DOWNTO 0) := "101"&"111111111001"&"0111"&"1100"&"00000010"&"000110"&"0";  -- 0=data path, 1=MM controlled TODO
 --CONSTANT c_sdp_cep_hdr_field_sel  : STD_LOGIC_VECTOR(c_sdp_cep_nof_hdr_fields-1 DOWNTO 0) := "100"&"000000010001"&"0100"&"0100"&"00000000"&"101000"&"0";  -- 0=data path, 1=MM controlled TODO