diff --git a/src/apps/httpd/httpd.c b/src/apps/httpd/httpd.c
index 1cb8adbb..3e3b9b23 100644
--- a/src/apps/httpd/httpd.c
+++ b/src/apps/httpd/httpd.c
@@ -110,7 +110,8 @@
 /** These defines check whether tcp_write has to copy data or not */
 
 /** This was TI's check whether to let TCP copy data or not
-#define HTTP_IS_DATA_VOLATILE(hs) ((hs->file < (char *)0x20000000) ? 0 : TCP_WRITE_FLAG_COPY)*/
+ * \#define HTTP_IS_DATA_VOLATILE(hs) ((hs->file < (char *)0x20000000) ? 0 : TCP_WRITE_FLAG_COPY)
+ */
 #ifndef HTTP_IS_DATA_VOLATILE
 #if LWIP_HTTPD_SSI
 /* Copy for SSI files, no copy for non-SSI files */
diff --git a/src/core/ipv4/dhcp.c b/src/core/ipv4/dhcp.c
index 42cf7c24..4c7f3549 100644
--- a/src/core/ipv4/dhcp.c
+++ b/src/core/ipv4/dhcp.c
@@ -91,8 +91,8 @@
 
 /** Default for DHCP_GLOBAL_XID is 0xABCD0000
  * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
- *  #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
- *  #define DHCP_GLOBAL_XID rand()
+ *  \#define DHCP_GLOBAL_XID_HEADER "stdlib.h"
+ *  \#define DHCP_GLOBAL_XID rand()
  */
 #ifdef DHCP_GLOBAL_XID_HEADER
 #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
diff --git a/src/include/lwip/apps/sntp_opts.h b/src/include/lwip/apps/sntp_opts.h
index b4871d79..063f549a 100644
--- a/src/include/lwip/apps/sntp_opts.h
+++ b/src/include/lwip/apps/sntp_opts.h
@@ -58,15 +58,14 @@
 #define SNTP_GET_SERVERS_FROM_DHCP LWIP_DHCP_GET_NTP_SRV
 #endif
 
-/* Set this to 1 to support DNS names (or IP address strings) to set sntp servers */
+/** Set this to 1 to support DNS names (or IP address strings) to set sntp servers
+ * One server address/name can be defined as default if SNTP_SERVER_DNS == 1:
+ * \#define SNTP_SERVER_ADDRESS "pool.ntp.org"
+ */
 #ifndef SNTP_SERVER_DNS
 #define SNTP_SERVER_DNS            0
 #endif
 
-/** One server address/name can be defined as default if SNTP_SERVER_DNS == 1:
- * #define SNTP_SERVER_ADDRESS "pool.ntp.org"
- */
-
 /**
  * SNTP_DEBUG: Enable debugging for SNTP.
  */
diff --git a/src/include/lwip/dhcp.h b/src/include/lwip/dhcp.h
index 3e2c6d29..ca19a2a2 100644
--- a/src/include/lwip/dhcp.h
+++ b/src/include/lwip/dhcp.h
@@ -204,9 +204,9 @@ void dhcp_fine_tmr(void);
 #define DHCP_STATE_SELECTING    6
 #define DHCP_STATE_INFORMING    7
 #define DHCP_STATE_CHECKING     8
-/** not yet implemented #define DHCP_STATE_PERMANENT 9 */
+/** not yet implemented \#define DHCP_STATE_PERMANENT 9 */
 #define DHCP_STATE_BOUND        10
-/** not yet implemented #define DHCP_STATE_RELEASING 11 */
+/** not yet implemented \#define DHCP_STATE_RELEASING 11 */
 #define DHCP_STATE_BACKING_OFF  12
 
 /** AUTOIP cooperation flags */