diff --git a/design/protocol.md b/design/protocol.md
index 5967de4..a9a4db8 100644
--- a/design/protocol.md
+++ b/design/protocol.md
@@ -63,10 +63,6 @@ in detail in the following sections.
 |  6 |  110 | KTV  | Key-tag-value table
 |  7 |  111 | N/A  | Reserved
 
-#### No Value (NIL)
-NIL is used to encode the absence of a value where there would otherwise be one.
-The CN of a NIL is ignored. It has no payload.
-
 #### Small Integer (SI)
 SI encodes an integer of up to 5 bits, which are stored in the CN. It has no
 payload. Whether the bits are interpreted as unsigned or as signed two's