diff --git a/include/types/channel.h b/include/types/channel.h
index 7622ce8..2d79c11 100644
--- a/include/types/channel.h
+++ b/include/types/channel.h
@@ -117,7 +117,7 @@
 
 #define CF_WAKE_ONCE      0x10000000  /* pretend there is activity on this channel (one-shoot) */
 #define CF_FLT_ANALYZE    0x20000000  /* at least one filter is still analyzing this channel */
-/* unused: 0x40000000 */
+#define CF_EOI            0x40000000  /* end-of-input has been reached */
 #define CF_ISRESP         0x80000000  /* 0 = request channel, 1 = response channel */
 
 /* Masks which define input events for stream analysers */