diff --git a/Ringbuffer-Channels.md b/Ringbuffer-Channels.md
index 41db2ff..4e5a13e 100644
--- a/Ringbuffer-Channels.md
+++ b/Ringbuffer-Channels.md
@@ -7,4 +7,12 @@
 * BUF_T2H
 * SHAREDMALLOC
   - Firmware requests memory allocation that can be shared with the Hosts via this channel
-* IO_T2H
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+* IO_T2H
+
+Data structures
+   struct bcwc_ringbuf_entry {
+        u32 address_flags;
+        u32 request_size;
+        u32 response_size;
+        u32 __unused[13];
+    } __attribute__((packed));
\ No newline at end of file