diff --git a/src/include/lwip/opt.h b/src/include/lwip/opt.h
index f45a34e7..5134185d 100644
--- a/src/include/lwip/opt.h
+++ b/src/include/lwip/opt.h
@@ -1038,7 +1038,7 @@
  *
  *  Instead, you can also use an external function:
  *  \#define DNS_LOOKUP_LOCAL_EXTERN(x) extern err_t my_lookup_function(const char *name, ip_addr_t *addr, u8_t dns_addrtype)
- *  that looks up the IP address and returns ERR_OK if found (LWIP_DNS_ADDRTYPE_* is passed in dns_addrtype).
+ *  that looks up the IP address and returns ERR_OK if found (LWIP_DNS_ADDRTYPE_xxx is passed in dns_addrtype).
  */
 #if !defined DNS_LOCAL_HOSTLIST || defined __DOXYGEN__
 #define DNS_LOCAL_HOSTLIST              0