diff --git a/index.html b/index.html
index 06ba4ca..5d260b7 100644
--- a/index.html
+++ b/index.html
@@ -694,8 +694,6 @@ <h3>Options</h3>
       <h4>Options Extensibility</h4>
       <p>
 Implementations MAY extend an `options` object with additional properties.
-Property keys can be any string but they should be appropriately namespaced (for example by using URIs)
-in order to avoid collisions with extensions in other implementations.
       </p>
       <p>
 As extension properties are implementation specific, they ought not be mandatory.