diff --git a/bootloader_message/include/bootloader_message/bootloader_message.h b/bootloader_message/include/bootloader_message/bootloader_message.h
index 798f3bb..95c19ae 100644
--- a/bootloader_message/include/bootloader_message/bootloader_message.h
+++ b/bootloader_message/include/bootloader_message/bootloader_message.h
@@ -103,13 +103,17 @@
  * implementations are free to use all 32 bytes and may store private
  * data past the first NUL-byte in this field. It is encouraged, but
  * not mandatory, to use 'struct bootloader_control' described below.
+ *
+ * The update_channel field is used to store the Omaha update channel
+ * if update_engine is compiled with Omaha support.
  */
 struct bootloader_message_ab {
     struct bootloader_message message;
     char slot_suffix[32];
+    char update_channel[128];
 
     // Round up the entire struct to 4096-byte.
-    char reserved[2016];
+    char reserved[1888];
 };
 
 /**