diff --git a/doc/api/zlib.md b/doc/api/zlib.md
index a3695eb8991ece..e3fd89981c126a 100644
--- a/doc/api/zlib.md
+++ b/doc/api/zlib.md
@@ -856,6 +856,8 @@ added:
  - v10.16.0
 -->
 
+* Extends: [`ZlibBase`][]
+
 Compress data using the Brotli algorithm.
 
 ## Class: `zlib.BrotliDecompress`
@@ -866,6 +868,8 @@ added:
  - v10.16.0
 -->
 
+* Extends: [`ZlibBase`][]
+
 Decompress data using the Brotli algorithm.
 
 ## Class: `zlib.Deflate`
@@ -874,6 +878,8 @@ Decompress data using the Brotli algorithm.
 added: v0.5.8
 -->
 
+* Extends: [`ZlibBase`][]
+
 Compress data using deflate.
 
 ## Class: `zlib.DeflateRaw`
@@ -882,6 +888,8 @@ Compress data using deflate.
 added: v0.5.8
 -->
 
+* Extends: [`ZlibBase`][]
+
 Compress data using deflate, and do not append a `zlib` header.
 
 ## Class: `zlib.Gunzip`
@@ -901,6 +909,8 @@ changes:
     description: A truncated input stream will now result in an `'error'` event.
 -->
 
+* Extends: [`ZlibBase`][]
+
 Decompress a gzip stream.
 
 ## Class: `zlib.Gzip`
@@ -909,6 +919,8 @@ Decompress a gzip stream.
 added: v0.5.8
 -->
 
+* Extends: [`ZlibBase`][]
+
 Compress data using gzip.
 
 ## Class: `zlib.Inflate`
@@ -921,6 +933,8 @@ changes:
     description: A truncated input stream will now result in an `'error'` event.
 -->
 
+* Extends: [`ZlibBase`][]
+
 Decompress a deflate stream.
 
 ## Class: `zlib.InflateRaw`
@@ -936,6 +950,8 @@ changes:
     description: A truncated input stream will now result in an `'error'` event.
 -->
 
+* Extends: [`ZlibBase`][]
+
 Decompress a raw deflate stream.
 
 ## Class: `zlib.Unzip`
@@ -944,6 +960,8 @@ Decompress a raw deflate stream.
 added: v0.5.8
 -->
 
+* Extends: [`ZlibBase`][]
+
 Decompress either a Gzip- or Deflate-compressed stream by auto-detecting
 the header.
 
@@ -959,6 +977,8 @@ changes:
     description: This class was renamed from `Zlib` to `ZlibBase`.
 -->
 
+* Extends: [`stream.Transform`][]
+
 Not exported by the `node:zlib` module. It is documented here because it is the
 base class of the compressor/decompressor classes.
 
@@ -1707,6 +1727,7 @@ Decompress a chunk of data with [`ZstdDecompress`][].
 [`InflateRaw`]: #class-zlibinflateraw
 [`Inflate`]: #class-zlibinflate
 [`Unzip`]: #class-zlibunzip
+[`ZlibBase`]: #class-zlibzlibbase
 [`ZstdCompress`]: #class-zlibzstdcompress
 [`ZstdDecompress`]: #class-zlibzstddecompress
 [`buffer.kMaxLength`]: buffer.md#bufferkmaxlength