diff --git a/library/ssl_tls12_server.c b/library/ssl_tls12_server.c
index a1505d1..58d6093 100644
--- a/library/ssl_tls12_server.c
+++ b/library/ssl_tls12_server.c
@@ -1286,7 +1286,10 @@
     if( buf[1] != 0 ||
         msg_len != mbedtls_ssl_hs_hdr_len( ssl ) + ( ( buf[2] << 8 ) | buf[3] ) )
     {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message: %u != %u + %u",
+                                    (unsigned) msg_len,
+                                    (unsigned) mbedtls_ssl_hs_hdr_len( ssl ),
+                                    (unsigned) ( buf[2] << 8 ) | buf[3] ) );
         return( MBEDTLS_ERR_SSL_DECODE_ERROR );
     }
 
@@ -1327,6 +1330,11 @@
          * For now we don't support fragmentation, so make sure
          * fragment_offset == 0 and fragment_length == length
          */
+        MBEDTLS_SSL_DEBUG_MSG(
+            4, ( "fragment_offset=%u fragment_length=%u length=%u",
+                 (unsigned) ( ssl->in_msg[6] << 16 | ssl->in_msg[7] << 8 | ssl->in_msg[8] ),
+                 (unsigned) ( ssl->in_msg[9] << 16 | ssl->in_msg[10] << 8 | ssl->in_msg[11] ),
+                 (unsigned) ( ssl->in_msg[1] << 16 | ssl->in_msg[2] << 8 | ssl->in_msg[3] ) ) );
         if( ssl->in_msg[6] != 0 || ssl->in_msg[7] != 0 || ssl->in_msg[8] != 0 ||
             memcmp( ssl->in_msg + 1, ssl->in_msg + 9, 3 ) != 0 )
         {