diff --git a/bip-0158.mediawiki b/bip-0158.mediawiki
index 1b7f8dff..034df633 100644
--- a/bip-0158.mediawiki
+++ b/bip-0158.mediawiki
@@ -258,9 +258,8 @@ against the decompressed GCS contents. See
 
 === Block Filters ===
 
-This BIP defines two initial filter types:
+This BIP defines one initial filter type:
 * Basic (<code>0x00</code>)
-* Extended (<code>0x01</code>)
 
 ==== Contents ====
 
@@ -269,15 +268,6 @@ sync a regular Bitcoin wallet. A basic filter MUST contain exactly the following
 items for each transaction in a block:
 * The outpoint of each input, except for the coinbase transaction
 * The scriptPubKey of each output
-The extended filter contains extra data that is meant to enable applications
-with more advanced smart contracts. An extended filter MUST contain exactly the
-following items for each transaction in a block ''except the coinbase'':
-* Each item within the witness stack of each input (if the input has a witness)
-* Each data push in the scriptSig of each input
-
-Note that neither filter type interprets P2SH scripts or witness scripts to
-extract data pushes from them. If necessary, future filter types may be designed
-to do so.
 
 ==== Construction ====