diff --git a/data/README.md b/data/README.md
index 0053e38..fac3476 100644
--- a/data/README.md
+++ b/data/README.md
@@ -1,4 +1,12 @@
-# GF_NTSC-plxxxxdata.bin.hbk:
+## GF_NTSC-plxxxxdata.bin.hbk:
 HexWorkshop bookmarks to use when playing with plxxxxdata(2/3).bin files (or their clone in plxxxx.pzz/000).
-# NTSC_Borgs.csv:
+## GG4E-CSM-20220412.map
+NTSC Community Symbol Map.
+
+Please add always a specific prefix for new resolved symbols with this format: "abc-".
+
+gnt4- symbols are verified and come from https://github.com/orgs/doldecomp/repositories
+
+Others come from dolphin emulator initial .dsy signature file.
+## NTSC_Borgs.csv:
 NTSC Borgs csv was usefull to search values using scripts.