Fix grammar
diff --git a/include/psa/crypto_values.h b/include/psa/crypto_values.h
index b78d11a..d766b9d 100644
--- a/include/psa/crypto_values.h
+++ b/include/psa/crypto_values.h
@@ -373,7 +373,7 @@
*/
#define PSA_KEY_TYPE_DERIVE ((psa_key_type_t)0x52000000)
-/** Key for an cipher, AEAD or MAC algorithm based on the AES block cipher.
+/** Key for a cipher, AEAD or MAC algorithm based on the AES block cipher.
*
* The size of the key can be 16 bytes (AES-128), 24 bytes (AES-192) or
* 32 bytes (AES-256).
@@ -391,7 +391,7 @@
*/
#define PSA_KEY_TYPE_DES ((psa_key_type_t)0x40000002)
-/** Key for an cipher, AEAD or MAC algorithm based on the
+/** Key for a cipher, AEAD or MAC algorithm based on the
* Camellia block cipher. */
#define PSA_KEY_TYPE_CAMELLIA ((psa_key_type_t)0x40000003)