diff --git a/applications/apertif/designs/apertif_unb1_correlator/revisions/apertif_unb1_correlator_bm6_bg_ch320/readme.txt b/applications/apertif/designs/apertif_unb1_correlator/revisions/apertif_unb1_correlator_bm6_bg_ch320/readme.txt
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index 0000000000000000000000000000000000000000..d5fe5ce75ef1093e5c9174912ee652f052040e36
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+++ b/applications/apertif/designs/apertif_unb1_correlator/revisions/apertif_unb1_correlator_bm6_bg_ch320/readme.txt
@@ -0,0 +1,12 @@
+# readme.txt
+
+needed settings to get out block generator chan320 data from unb1 board.
+
+1) set "g_mdio_epcs_dis" in "tr_10GbE" on TRUE normal is FALSE
+2) set "g_direction" in "tr_10GbE" on "TX_ONLY" normal is "TX_RX"
+
+Both generics are now available in "apertif_unb1_correlator_nodes.vhd" and are set in "apertif_unb1_correlator_bm6_bg_ch320"
+to the following values.
+
+g_mdio_epcs_dis  : BOOLEAN := TRUE        -- Be compatible with 10GbE (Chelsio) card in PC
+g_direction      : STRING  := "TX_ONLY"   -- "TX_RX", "TX_ONLY", "RX_ONLY"
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