diff --git a/src/crypto/cipher/gcm.go b/src/crypto/cipher/gcm.go
index cf13319dfe..5f18f8c490 100644
--- a/src/crypto/cipher/gcm.go
+++ b/src/crypto/cipher/gcm.go
@@ -37,7 +37,7 @@ type AEAD interface {
 	// value passed to Seal.
 	//
 	// The ciphertext and dst may alias exactly or not at all. To reuse
-	// ciphertext's storage for the encrypted output, use ciphertext[:0] as dst.
+	// ciphertext's storage for the decrypted output, use ciphertext[:0] as dst.
 	Open(dst, nonce, ciphertext, additionalData []byte) ([]byte, error)
 }