diff --git a/README.md b/README.md
index ef74194..e2a2435 100644
--- a/README.md
+++ b/README.md
@@ -61,9 +61,15 @@ Arduino based project running on my custom made board
 * RTClib-master (not my work) [link](https://github.com/adafruit/RTClib)
 * AT24CXX-master (not my work) [link](https://github.com/cyberp/AT24Cx)
 
-### SD Card structure :
-TO DO
-
+### SD Card structure (subject to changes) :
+```
+/
+|_CONFIG
+|   STA.CFG
+|   AP.CFG
+|_WWW
+|_FTP
+```
 ### Things to do :
 * Screen Manager 	✓
 * µSDcard File System