From 898e4f7c564b4a61cf00b77b7ee089db04ba9d91 Mon Sep 17 00:00:00 2001
From: Robert Smith <robert.smith@florey.edu.au>
Date: Mon, 13 Dec 2021 10:03:22 +1100
Subject: [PATCH] Entity table: Clarify meaning of empty cells

---
 src/99-appendices/04-entity-table.md | 3 ++-
 src/99-appendices/09-entities.md     | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/99-appendices/04-entity-table.md b/src/99-appendices/04-entity-table.md
index 0151c08738..68ba9ff11e 100644
--- a/src/99-appendices/04-entity-table.md
+++ b/src/99-appendices/04-entity-table.md
@@ -4,7 +4,8 @@ This section compiles the entities (key-value pairs) described throughout this
 specification, and establishes a common order within a filename.
 For example, if a file has an acquisition and reconstruction label, the
 acquisition entity must precede the reconstruction entity.
-REQUIRED and OPTIONAL entities for a given file type are denoted.
+REQUIRED and OPTIONAL entities for a given file type are denoted;
+empty cells imply that entities MUST NOT be specified.
 Entity formats indicate whether the value is alphanumeric
 (`<label>`) or numeric (`<index>`).
 
diff --git a/src/99-appendices/09-entities.md b/src/99-appendices/09-entities.md
index 196ae27ac2..f8f2250ef9 100644
--- a/src/99-appendices/09-entities.md
+++ b/src/99-appendices/09-entities.md
@@ -6,8 +6,8 @@ specification, and describes each.
 A general introduction to entities is given in the section on
 [file name structure](../02-common-principles.md#file-name-structure).
 
-The ordering of entities and whether it is allowed, OPTIONAL, or REQUIRED for
-each is given in the [Entity Table](04-entity-table.md).
+The ordering of entities, and whether each is OPTIONAL, REQUIRED, or MUST NOT
+be specified for a given file type, is specified in the [Entity Table](04-entity-table.md).
 
 <!--
   This section is autogenerated based on the src/schema.  DO NOT EDIT DIRECTLY.