diff -r 1a8fe7b7dd8a -r 151c057faf7c docs/Writerside/topics/collection.h.md
--- a/docs/Writerside/topics/collection.h.md	Sat Jan 25 13:40:50 2025 +0100
+++ b/docs/Writerside/topics/collection.h.md	Sat Jan 25 13:44:24 2025 +0100
@@ -1,5 +1,9 @@
 # Collections
 
+<warning>
+Outdated - Rewrite!
+</warning>
+
 Collections in UCX 3 have several common features.
 If you want to implement an own collection data type that uses the same features, you can use the
 `CX_COLLECTION_BASE` macro at the beginning of your struct to roll out all members a usual UCX collection has.