mbedtls_config: improved description of PK_PARSE_EC_COMPRESSED

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index ccb70a6..e151042 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -1050,8 +1050,11 @@
  *
  * Enable the support for parsing public keys of type Short Weierstrass
  * (MBEDTLS_ECP_DP_SECP_XXX and MBEDTLS_ECP_DP_BP_XXX) which are using the
- * compressed point format.
- * Please see MBEDTLS_ECP_PF_COMPRESSED in ecp.h for limitations details.
+ * compressed point format. This parsing is done through ECP module's functions.
+ *
+ * \note As explained in the description of MBEDTLS_ECP_PF_COMPRESSED (in ecp.h)
+ *       the only unsupported curves are MBEDTLS_ECP_DP_SECP224R1 and
+ *       MBEDTLS_ECP_DP_SECP224K1.
  */
 #define MBEDTLS_PK_PARSE_EC_COMPRESSED