From 60827b862e4f0ef2b5117df30494a7f5918dd8b1 Mon Sep 17 00:00:00 2001
From: Ian Douglas Scott <idscott@system76.com>
Date: Tue, 12 Jul 2022 21:23:55 -0700
Subject: Document which type are nullable, and wire format for null value

Signed-off-by: Ian Douglas Scott <idscott@system76.com>
---
 doc/publican/sources/Protocol.xml | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'doc')

diff --git a/doc/publican/sources/Protocol.xml b/doc/publican/sources/Protocol.xml
index 580cecb..57d8835 100644
--- a/doc/publican/sources/Protocol.xml
+++ b/doc/publican/sources/Protocol.xml
@@ -151,7 +151,8 @@
 	    <para>
 	      Starts with an unsigned 32-bit length (including null terminator),
 	      followed by the string contents, including terminating null byte,
-	      then padding to a 32-bit boundary.
+	      then padding to a 32-bit boundary. A null value is represented
+	      with a length of 0.
 	    </para>
 	  </listitem>
 	</varlistentry>
@@ -159,7 +160,7 @@
 	  <term>object</term>
 	  <listitem>
 	    <para>
-	      32-bit object ID.
+	      32-bit object ID. A null value is represented with an ID of 0.
 	    </para>
 	  </listitem>
 	</varlistentry>
-- 
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