Index: core/mem.c
===================================================================
--- core/mem.c	(revision 408)
+++ core/mem.c	(working copy)
@@ -10,7 +10,7 @@
  * To let mem_malloc() use pools (prevents fragmentation and is much faster than
  * a heap but might waste some memory), define MEM_USE_POOLS to 1, define
  * MEM_USE_CUSTOM_POOLS to 1 and create a file "lwippools.h" that includes a list
- * of pools like the this (more pools can be added between _START and _END):
+ * of pools like this (more pools can be added between _START and _END):
  *
  * Define three pools with sizes 256, 512, and 1512 bytes
  * LWIP_MALLOC_MEMPOOL_START
Index: core/udp.c
===================================================================
--- core/udp.c	(revision 408)
+++ core/udp.c	(working copy)
@@ -412,7 +412,7 @@
 
   /* not enough space to add an UDP header to first pbuf in given p chain? */
   if (pbuf_header(p, UDP_HLEN)) {
-    /* allocate header in a seperate new pbuf */
+    /* allocate header in a separate new pbuf */
     q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
     /* new header pbuf could not be allocated? */
     if (q == NULL) {
@@ -527,7 +527,7 @@
   /* TODO: must this be increased even if error occured? */
   snmp_inc_udpoutdatagrams();
 
-  /* did we chain a seperate header pbuf earlier? */
+  /* did we chain a separate header pbuf earlier? */
   if (q != p) {
     /* free the header pbuf */
     pbuf_free(q);
Index: include/lwip/opt.h
===================================================================
--- include/lwip/opt.h	(revision 408)
+++ include/lwip/opt.h	(working copy)
@@ -390,8 +390,8 @@
 /**
  * IP_FRAG_USES_STATIC_BUF==1: Use a static MTU-sized buffer for IP
  * fragmentation. Otherwise pbufs are allocated and reference the original
-    * packet data to be fragmented.
-*/
+ * packet data to be fragmented.
+ */
 #ifndef IP_FRAG_USES_STATIC_BUF
 #define IP_FRAG_USES_STATIC_BUF         1
 #endif
@@ -763,7 +763,6 @@
  * PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. The default is
  * designed to accomodate single full size TCP frame in one pbuf, including
  * TCP_MSS, IP header, and link header.
-*
  */
 #ifndef PBUF_POOL_BUFSIZE
 #define PBUF_POOL_BUFSIZE               LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_HLEN)