diff --git a/TelegramBots.wiki/understanding-the-library/Understanding-The-Library.md b/TelegramBots.wiki/understanding-the-library/Understanding-The-Library.md
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@@ -1,4 +1,6 @@
 # Understanding the Library
+Last updated: 2020-03-04
+
 
 This little handy guide will not teach you how to do a particular thing in the library. 
 It will also not teach you how to create bots or anything in the liking of that.