diff --git a/doc/api/zlib.md b/doc/api/zlib.md
index a3695eb8991ece..669dfc802ef9e9 100644
--- a/doc/api/zlib.md
+++ b/doc/api/zlib.md
@@ -1049,6 +1049,7 @@ Each Zstd-based class takes an `options` object. All options are optional.
 * `params` {Object} Key-value object containing indexed [Zstd parameters][].
 * `maxOutputLength` {integer} Limits output size when using
   [convenience methods][]. **Default:** [`buffer.kMaxLength`][]
+* `info` {boolean} (If `true`, returns an object with `buffer` and `engine`.)
 
 For example: