diff --git a/include/nuttx/net/sixlowpan.h b/include/nuttx/net/sixlowpan.h
index 0d403d25bb8..be3bfa76365 100644
--- a/include/nuttx/net/sixlowpan.h
+++ b/include/nuttx/net/sixlowpan.h
@@ -333,17 +333,28 @@ struct rimeaddr_s
  * 2) i_dsn must be set to a random value.  After that, it will be managed
  *    by the network.
  * 3) i_nodeaddr must be set after the MAC is assigned an address.
+ * 4) On network TX poll operations, the IEEE802.15.4 MAC needs to provide
+ *    the i_frame buffer with size greater than or equal to
+ *    CONFIG_NET_6LOWPAN_FRAMELEN.  No dev.d_buf need be provided in this
+ *    case.  The entire is TX is performed using only the i_frame buffer.
+ * 5) On network input RX oprations, both buffers must be provided.  The size
+ *    of the i_frame buffer is, again, greater than or equal to
+ *    CONFIG_NET_6LOWPAN_FRAMELEN.  The larger dev.d_buf must have a size
+ *    of at least <tbd>.  The dev.d_buf is used for de-compressing each
+ *    frame and reassembling any fragmented packets to create the full input
+ *    packet that is provided to the applicatino.
  *
  * Frame Organization:
  *
- *     Content          Offset
- *   +----------------+ 0
- *   | Frame Header   |
- *   +----------------+ i_dataoffset
- *   | Data           |
- *   +----------------+ i_framelen
- *   | Unused         |
- *   +----------------+ CONFIG_NET_6LOWPAN_FRAMELEN
+ *     Content            Offset
+ *   +------------------+ 0
+ *   | Frame Header     |
+ *   +------------------+ i_dataoffset
+ *   | Procotol Headers |
+ *   | Data Payload     |
+ *   +------------------+ i_framelen
+ *   | Unused           |
+ *   +------------------+ CONFIG_NET_6LOWPAN_FRAMELEN
  */
 
 struct ieee802154_driver_s
diff --git a/net/sixlowpan/sixlowpan_framer.c b/net/sixlowpan/sixlowpan_framer.c
index 611e204a9f8..2b528dea10d 100644
--- a/net/sixlowpan/sixlowpan_framer.c
+++ b/net/sixlowpan/sixlowpan_framer.c
@@ -109,35 +109,6 @@ static inline uint8_t sixlowpan_addrlen(uint8_t addrmode)
     }
 }
 
-/****************************************************************************
- * Function: sixlowpan_isbroadcast
- *
- * Description:
- *   Return the address length associated with a 2-bit address mode
- *
- * Input parameters:
- *   addrmode - The address mode
- *
- * Returned Value:
- *   The address length associated with the address mode.
- *
- ****************************************************************************/
-
-static bool sixlowpan_isbroadcast(uint8_t mode, FAR uint8_t *addr)
-{
-  int i = ((mode == FRAME802154_SHORTADDRMODE) ? 2 : 8);
-
-  while (i-- > 0)
-    {
-      if (addr[i] != 0xff)
-        {
-          return false;
-        }
-    }
-
-  return true;
-}
-
 /****************************************************************************
  * Function: sixlowpan_addrnull
  *
diff --git a/net/sixlowpan/sixlowpan_input.c b/net/sixlowpan/sixlowpan_input.c
index 964d988be72..ce520f8e5e3 100644
--- a/net/sixlowpan/sixlowpan_input.c
+++ b/net/sixlowpan/sixlowpan_input.c
@@ -46,6 +46,39 @@
 
 #ifdef CONFIG_NET_6LOWPAN
 
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: sixlowpan_isbroadcast
+ *
+ * Description:
+ *   Return the address length associated with a 2-bit address mode
+ *
+ * Input parameters:
+ *   addrmode - The address mode
+ *
+ * Returned Value:
+ *   The address length associated with the address mode.
+ *
+ ****************************************************************************/
+
+static bool sixlowpan_isbroadcast(uint8_t mode, FAR uint8_t *addr)
+{
+  int i = ((mode == FRAME802154_SHORTADDRMODE) ? 2 : 8);
+
+  while (i-- > 0)
+    {
+      if (addr[i] != 0xff)
+        {
+          return false;
+        }
+    }
+
+  return true;
+}
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
diff --git a/net/sixlowpan/sixlowpan_utils.c b/net/sixlowpan/sixlowpan_utils.c
index a12394407f6..f00eaeae4c3 100644
--- a/net/sixlowpan/sixlowpan_utils.c
+++ b/net/sixlowpan/sixlowpan_utils.c
@@ -46,14 +46,15 @@
  ****************************************************************************/
 /* Frame Organization:
  *
- *     Content          Offset
- *   +----------------+ 0
- *   | Frame Header   |
- *   +----------------+ i_dataoffset
- *   | Data           |
- *   +----------------+ i_framelen
- *   | Unused         |
- *   +----------------+ CONFIG_NET_6LOWPAN_FRAMELEN
+ *     Content            Offset
+ *   +------------------+ 0
+ *   | Frame Header     |
+ *   +------------------+ i_dataoffset
+ *   | Procotol Headers |
+ *   | Data Payload     |
+ *   +------------------+ i_framelen
+ *   | Unused           |
+ *   +------------------+ CONFIG_NET_6LOWPAN_FRAMELEN
  */
 
 /****************************************************************************