diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index c28937df14..373918a885 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -7145,6 +7145,9 @@ exit:
 #endif
 
 /** Initialize the PSA random generator.
+ *
+ *  Note: the mbedtls_threading_psa_rngdata_mutex should be held when calling
+ *  this function if mutexes are enabled.
  */
 static void mbedtls_psa_random_init(mbedtls_psa_random_context_t *rng)
 {
@@ -7177,6 +7180,9 @@ static void mbedtls_psa_random_init(mbedtls_psa_random_context_t *rng)
 }
 
 /** Deinitialize the PSA random generator.
+ *
+ *  Note: the mbedtls_threading_psa_rngdata_mutex should be held when calling
+ *  this function if mutexes are enabled.
  */
 static void mbedtls_psa_random_free(mbedtls_psa_random_context_t *rng)
 {