psa-transition: update with MD translation functions
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/docs/psa-transition.md b/docs/psa-transition.md
index 067ffaf..48beb80 100644
--- a/docs/psa-transition.md
+++ b/docs/psa-transition.md
@@ -443,6 +443,10 @@
| `MBEDTLS_MD_SHA3_384` | `PSA_ALG_SHA3_384` |
| `MBEDTLS_MD_SHA3_512` | `PSA_ALG_SHA3_512` |
+The following helper functions can be used to convert between the 2 types:
+- `mbedtls_md_psa_alg_from_type()` converts from legacy `mbedtls_md_type_t` to PSA's `psa_algorithm_t`.
+- `mbedtls_md_type_from_psa_alg()` converts from PSA's `psa_algorithm_t` to legacy `mbedtls_md_type_t`.
+
### MAC mechanism selection
PSA Crypto has a generic API with the same functions for all MAC mechanisms. The mechanism is determined by a combination of an algorithm value of type [`psa_algorithm_t`](https://mbed-tls.readthedocs.io/projects/api/en/development/api/group/group__crypto__types/#group__crypto__types_1gac2e4d47f1300d73c2f829a6d99252d69) and a key type value of type [`psa_key_type_t`](https://mbed-tls.readthedocs.io/projects/api/en/development/api/group/group__crypto__types/#group__crypto__types_1ga63fce6880ca5933b5d6baa257febf1f6).