diff --git a/crypto/cmp/cmp_kem.c b/crypto/cmp/cmp_kem.c
index ed10279092cc8d..9f84209001e13f 100644
--- a/crypto/cmp/cmp_kem.c
+++ b/crypto/cmp/cmp_kem.c
@@ -44,6 +44,7 @@ static int kdf2(OSSL_CMP_CTX *ctx, unsigned char *secret, size_t secret_len,
     return 1;
 }
 
+/* TODO: look for existing OpenSSL solution */
 static int x509_algor_from_nid_with_md(int nid, X509_ALGOR **palg,
                                        const EVP_MD *md)
 {