diff --git a/README.md b/README.md
index 4291045..231a130 100644
--- a/README.md
+++ b/README.md
@@ -4,10 +4,11 @@ Convert sparse Android data image (.dat) into filesystem ext4 image (.img)
 
 
 ## Requirements
-This binary requires Python 2.7 or newer installed on your system.
-
+This binary requires Python 2.7 or newer installed on your system. 
 It currently supports Windows, Linux, MacOS & ARM architectures.
 
+**Note:** newer Google's [Brotli](https://github.com/google/brotli) format (`system.new.dat.br`) must be decompressed to a valid sparse data image before using `sdat2img` binary.
+
 
 
 ## Usage