diff --git a/doc/api/crypto.md b/doc/api/crypto.md
index 001b16584621fc..fb4a667fff0035 100644
--- a/doc/api/crypto.md
+++ b/doc/api/crypto.md
@@ -1633,6 +1633,7 @@ added: v0.11.14
     `crypto.constants`, which may be: `crypto.constants.RSA_NO_PADDING`,
     `RSA_PKCS1_PADDING`, or `crypto.constants.RSA_PKCS1_OAEP_PADDING`.
 - `buffer` {Buffer | TypedArray | DataView}
+- Returns: {Buffer} A new `Buffer` with the decrypted content.
 
 Decrypts `buffer` with `privateKey`.
 
@@ -1650,6 +1651,7 @@ added: v1.1.0
     `crypto.constants`, which may be: `crypto.constants.RSA_NO_PADDING` or
     `RSA_PKCS1_PADDING`.
 - `buffer` {Buffer | TypedArray | DataView}
+- Returns: {Buffer} A new `Buffer` with the encrypted content.
 
 Encrypts `buffer` with `privateKey`.
 
@@ -1667,6 +1669,7 @@ added: v1.1.0
     `crypto.constants`, which may be: `crypto.constants.RSA_NO_PADDING` or
     `RSA_PKCS1_PADDING`.
 - `buffer` {Buffer | TypedArray | DataView}
+- Returns: {Buffer} A new `Buffer` with the decrypted content.
 
 Decrypts `buffer` with `publicKey`.
 
@@ -1687,6 +1690,7 @@ added: v0.11.14
     `crypto.constants`, which may be: `crypto.constants.RSA_NO_PADDING`,
     `RSA_PKCS1_PADDING`, or `crypto.constants.RSA_PKCS1_OAEP_PADDING`.
 - `buffer` {Buffer | TypedArray | DataView}
+- Returns: {Buffer} A new `Buffer` with the encrypted content.
 
 Encrypts the content of `buffer` with `publicKey` and returns a new
 [`Buffer`][] with encrypted content.