chore: adds a note about namespace collisions in the namespace spec (c…

…elestiaorg#3104)

Closes celestiaorg#2125

specs/src/specs/namespace.md

@@ -87,6 +87,10 @@ For additional information on the significance and application of the reserved n
 
 Applications MUST refrain from using the [reserved namespaces](#reserved-namespaces) for their blob data.
 
+Celestia does not ensure the prevention of non-reserved namespace collisions. 
+Consequently, two distinct applications might use the same namespace.
+It is the responsibility of these applications to be cautious and manage the implications and consequences arising from such namespace collisions.
+
 ## Implementation
 
 See [go-square/namespace](https://github.com/celestiaorg/go-square/tree/main/namespace).