diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 5004dc9..b975116 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -4687,6 +4687,7 @@
                 ssl->conf->ignore_unexpected_cid
                     == MBEDTLS_SSL_UNEXPECTED_CID_IGNORE )
             {
+                MBEDTLS_SSL_DEBUG_MSG( 3, ( "ignoring unexpected CID" ) );
                 ret = MBEDTLS_ERR_SSL_CONTINUE_PROCESSING;
             }
 #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */