diff --git a/libavutil/des.h b/libavutil/des.h
index 4cf11f5bca..3a3e6fa47c 100644
--- a/libavutil/des.h
+++ b/libavutil/des.h
@@ -43,6 +43,8 @@ AVDES *av_des_alloc(void);
 /**
  * @brief Initializes an AVDES context.
  *
+ * @param d pointer to a AVDES structure to initialize
+ * @param key pointer to the key to use
  * @param key_bits must be 64 or 192
  * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption
  * @return zero on success, negative value otherwise
@@ -52,9 +54,10 @@ int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt);
 /**
  * @brief Encrypts / decrypts using the DES algorithm.
  *
- * @param count number of 8 byte blocks
+ * @param d pointer to the AVDES structure
  * @param dst destination array, can be equal to src, must be 8-byte aligned
  * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
+ * @param count number of 8 byte blocks
  * @param iv initialization vector for CBC mode, if NULL then ECB will be used,
  *           must be 8-byte aligned
  * @param decrypt 0 for encryption, 1 for decryption
@@ -64,9 +67,10 @@ void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count,
 /**
  * @brief Calculates CBC-MAC using the DES algorithm.
  *
- * @param count number of 8 byte blocks
+ * @param d pointer to the AVDES structure
  * @param dst destination array, can be equal to src, must be 8-byte aligned
  * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
+ * @param count number of 8 byte blocks
  */
 void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count);