diff --git a/library/ssl_tls13_invasive.h b/library/ssl_tls13_invasive.h
index 8a3a501..4e39f90 100644
--- a/library/ssl_tls13_invasive.h
+++ b/library/ssl_tls13_invasive.h
@@ -30,10 +30,7 @@
  *  \brief  Take the input keying material \p ikm and extract from it a
  *          fixed-length pseudorandom key \p prk.
  *
- *  \param       alg       The HMAC algorithm to use
- *                         (\c #PSA_ALG_HMAC( PSA_ALG_XXX ) value such that
- *                         PSA_ALG_XXX is a hash algorithm and
- *                         #PSA_ALG_IS_HMAC(\p alg) is true).
+ *  \param       hash_alg  Hash algorithm to use.
  *  \param       salt      An optional salt value (a non-secret random value);
  *                         if the salt is not provided, a string of all zeros
  *                         of the length of the hash provided by \p alg is used
@@ -51,7 +48,7 @@
  *  \return An PSA_ERROR_* error for errors returned from the underlying
  *          PSA layer.
  */
-psa_status_t mbedtls_psa_hkdf_extract( psa_algorithm_t alg,
+psa_status_t mbedtls_psa_hkdf_extract( psa_algorithm_t hash_alg,
                                        const unsigned char *salt, size_t salt_len,
                                        const unsigned char *ikm, size_t ikm_len,
                                        unsigned char *prk, size_t prk_size,
@@ -61,9 +58,7 @@
  *  \brief  Expand the supplied \p prk into several additional pseudorandom
  *          keys, which is the output of the HKDF.
  *
- *  \param  alg       The HMAC algorithm to use (\c #PSA_ALG_HMAC( PSA_ALG_XXX )
- *                    value such that PSA_ALG_XXX is a hash algorithm and
- *                    #PSA_ALG_IS_HMAC(\p alg) is true).
+ *  \param  hash_alg  Hash algorithm to use.
  *  \param  prk       A pseudorandom key of \p prk_len bytes. \p prk is
  *                    usually the output from the HKDF extract step.
  *  \param  prk_len   The length in bytes of \p prk.
@@ -80,7 +75,7 @@
  *  \return An PSA_ERROR_* error for errors returned from the underlying
  *          PSA layer.
  */
-psa_status_t mbedtls_psa_hkdf_expand( psa_algorithm_t alg,
+psa_status_t mbedtls_psa_hkdf_expand( psa_algorithm_t hash_alg,
                                       const unsigned char *prk, size_t prk_len,
                                       const unsigned char *info, size_t info_len,
                                       unsigned char *okm, size_t okm_len );