diff --git a/README b/README
index f555d48..8b2b3ad 100644
--- a/README
+++ b/README
@@ -9,4 +9,7 @@ Telegram bot with light group statistic and heavy spy features.
 * Generate sentences using Markov Chains trained on history with /markov_all.
 
 == TODO ==
-* Syntax highlighting for code exported to image.
\ No newline at end of file
+* Syntax highlighting for code exported to image.
+
+== Notes ==
+* Desubot uses MyStem by Yandex for word stemming and assume that mystem binary is available in PATH. On Windows it may be placed on working directory. Both Linux and Windows mystem binary is in repo.
\ No newline at end of file