diff --git a/src/chunk.c b/src/chunk.c
index 1722bf48..61aae1f7 100644
--- a/src/chunk.c
+++ b/src/chunk.c
@@ -170,7 +170,7 @@ int chunkqueue_append_file(chunkqueue *cq, buffer *fn, off_t offset, off_t len)
 	c->type = FILE_CHUNK;
 	
 	buffer_copy_string_buffer(c->file.name, fn);
-	c->file.offset = offset;
+	c->file.start = offset;
 	c->file.length = len;
 	c->offset = 0;
 	
diff --git a/src/chunk.h b/src/chunk.h
index 3609e4d9..c65c3b11 100644
--- a/src/chunk.h
+++ b/src/chunk.h
@@ -4,36 +4,31 @@
 #include "buffer.h"
 
 typedef struct chunk {
-	/* 
-	 * MEM_CHUNK
-	 *   b: the chunk it self
-	 * FILE_CHUNK
-	 *   b: a buffer for the filename
-	 */
-	
 	enum { UNUSED_CHUNK, MEM_CHUNK, FILE_CHUNK } type;
 	
-	/* memchunk */
-	buffer *mem; /* it might be large */
+	buffer *mem; /* either the storage of the mem-chunk or the read-ahead buffer */
 
 	struct {
 		/* filechunk */
-		buffer *name;
-		off_t  offset;
-		off_t  length;
+		buffer *name; /* name of the file */
+		off_t  start; /* starting offset in the file */
+		off_t  length; /* octets to send from the starting offset */
 
 		int    fd;
 		struct { 
-			char   *start;
-			size_t length;
+			char   *start; /* the start pointer of the mmap'ed area */
+			size_t length; /* size of the mmap'ed area */
+			off_t  offset; /* start is <n> octet away from the start of the file */
 		} mmap;
 
-		int is_temp;
+		int is_temp; /* file is temporary and will be deleted if on cleanup */
 	} file;
 	
-	/* how many bytes are already handled */
-	
-	off_t  offset;
+	off_t  offset; /* octets sent from this chunk 
+			  the size of the chunk is either 
+			  - mem-chunk: mem->used - 1
+			  - file-chunk: file.length
+			*/
 	
 	struct chunk *next;
 } chunk;
diff --git a/src/network_freebsd_sendfile.c b/src/network_freebsd_sendfile.c
index 53c6746a..a6994c01 100644
--- a/src/network_freebsd_sendfile.c
+++ b/src/network_freebsd_sendfile.c
@@ -143,7 +143,7 @@ int network_write_chunkqueue_freebsdsendfile(server *srv, connection *con, int f
 				return -1;
 			}
 			
-			offset = c->file.offset + c->offset;
+			offset = c->file.start + c->offset;
 			/* limit the toSend to 2^31-1 bytes in a chunk */
 			toSend = c->file.length - c->offset > ((1 << 30) - 1) ? 
 				((1 << 30) - 1) : c->file.length - c->offset;
diff --git a/src/network_linux_sendfile.c b/src/network_linux_sendfile.c
index d7f5e86d..5628a94e 100644
--- a/src/network_linux_sendfile.c
+++ b/src/network_linux_sendfile.c
@@ -134,7 +134,7 @@ int network_write_chunkqueue_linuxsendfile(server *srv, connection *con, int fd,
 				return -1;
 			}
 			
-			offset = c->file.offset + c->offset;
+			offset = c->file.start + c->offset;
 			/* limit the toSend to 2^31-1 bytes in a chunk */
 			toSend = c->file.length - c->offset > ((1 << 30) - 1) ? 
 				((1 << 30) - 1) : c->file.length - c->offset;
diff --git a/src/network_openssl.c b/src/network_openssl.c
index 9de75309..3a0b492d 100644
--- a/src/network_openssl.c
+++ b/src/network_openssl.c
@@ -157,7 +157,7 @@ int network_write_chunkqueue_openssl(server *srv, connection *con, SSL *ssl, chu
 
 			do {
 			
-				offset = c->file.offset + c->offset;
+				offset = c->file.start + c->offset;
 				toSend = c->file.length - c->offset;
 
 				if (toSend > LOCAL_SEND_BUFSIZE) toSend = LOCAL_SEND_BUFSIZE;
diff --git a/src/network_solaris_sendfilev.c b/src/network_solaris_sendfilev.c
index 9c4ca625..0ab669f0 100644
--- a/src/network_solaris_sendfilev.c
+++ b/src/network_solaris_sendfilev.c
@@ -151,7 +151,7 @@ int network_write_chunkqueue_solarissendfilev(server *srv, connection *con, int
 				return -1;
 			}
 					
-			offset = c->file.offset + c->offset;
+			offset = c->file.start + c->offset;
 			toSend = c->file.length - c->offset;
 			
 			if (offset > sce->st.st_size) {
diff --git a/src/network_write.c b/src/network_write.c
index 177e90b6..90fc2ac9 100644
--- a/src/network_write.c
+++ b/src/network_write.c
@@ -83,7 +83,7 @@ int network_write_chunkqueue_write(server *srv, connection *con, int fd, chunkqu
 				return -1;
 			}
 			
-			offset = c->file.offset + c->offset;
+			offset = c->file.start + c->offset;
 			toSend = c->file.length - c->offset;
 			
 			if (offset > sce->st.st_size) {