diff --git a/404.txt b/404.txt
index de0eb65..93fbdd5 100644
--- a/404.txt
+++ b/404.txt
@@ -37,6 +37,7 @@ into some framework" type of topics.
   PR249 Tepaluotųjų pirščiukų kampelis. Ir mažiems, ir dideliems .... @kestlovas
   PR250 Groups vs teams: differences in decision making process ....... @rutaisa
   PR251 My approach to Personal Knowledge Management (PKM) .......... @4giedrius
+  PR252 Scuba Diving 101: Practical Intro to Underwater Exploration .... @rockaz
 
 
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