diff --git a/include/mbedtls/pk.h b/include/mbedtls/pk.h
index 0392bd4..e66a9f8 100644
--- a/include/mbedtls/pk.h
+++ b/include/mbedtls/pk.h
@@ -804,6 +804,9 @@
  *                  with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
  *                  specific key type, check the result with mbedtls_pk_can_do().
  *
+ * \note            For compressed points, see #MBEDTLS_ECP_PF_COMPRESSED for
+ *                  limitations.
+ *
  * \note            The key is also checked for correctness.
  *
  * \return          0 if successful, or a specific PK or PEM error code