diff --git a/doc/api/crypto.md b/doc/api/crypto.md
index 4dce34692c2aea..7dd4e2ecbf4db6 100644
--- a/doc/api/crypto.md
+++ b/doc/api/crypto.md
@@ -1643,7 +1643,7 @@ changes:
 
 * `algorithm` {string}
 * `key` {string | Buffer | TypedArray | DataView | KeyObject}
-* `iv` {string | Buffer | TypedArray | DataView}
+* `iv` {string | Buffer | TypedArray | DataView | null}
 * `options` {Object} [`stream.transform` options][]
 * Returns: {Cipher}
 
@@ -1737,7 +1737,7 @@ changes:
 
 * `algorithm` {string}
 * `key` {string | Buffer | TypedArray | DataView}
-* `iv` {string | Buffer | TypedArray | DataView}
+* `iv` {string | Buffer | TypedArray | DataView | null}
 * `options` {Object} [`stream.transform` options][]
 * Returns: {Decipher}