diff --git a/epub33/core/index.html b/epub33/core/index.html
index 780b43eef..b2a8d0f20 100644
--- a/epub33/core/index.html
+++ b/epub33/core/index.html
@@ -1247,6 +1247,12 @@ <h3>Exempt resources</h3>
 					resources (i.e., the requirement for a fallback for the foreign content document covers any
 					rendering issues within it). As the resource is not referenced from an EPUB content document, it
 					automatically becomes exempt from fallbacks.</p>
+
+				<div class="note">
+					<p>Resources that fall under this latter exemption should be identified in the manifest using the
+							<code>exempt</code> property on their [^item^] entry to avoid their being flagged by EPUB
+						conformance checkers. Refer to <a href="#sec-exempt"></a> for more information.</p>
+				</div>
 			</section>
 
 			<section id="sec-resource-fallbacks">
@@ -4932,6 +4938,9 @@ <h6>Resource properties</h6>
 							<li><a href="#sec-switch">switch</a></li>
 						</ul>
 
+						<p>EPUB creators SHOULD set the <a href="#sec-exempt">exempt</a> property whenever a resource
+							referenced by an <code>item</code> element matches its definition.</p>
+
 						<aside class="example" id="example-item-properties-scripted-mathml"
 							title="Identifying a scripted content document with embedded MathML">
 							<pre class="synopsis">&lt;item
diff --git a/epub33/core/vocab/item-properties.html b/epub33/core/vocab/item-properties.html
index 71528e633..27abb7075 100644
--- a/epub33/core/vocab/item-properties.html
+++ b/epub33/core/vocab/item-properties.html
@@ -37,6 +37,43 @@ <h4>cover-image</h4>
 		</table>
 	</section>
 	
+	<section id="sec-exempt">
+		<h4>exempt</h4>
+		
+		<table class="tabledef" id="exempt">
+			<tbody>
+				<tr>
+					<th>Name:</th>
+					<td>
+						<code>exempt</code>
+					</td>
+				</tr>
+				<tr>
+					<th>Description:</th>
+					<td>
+						<p>The <code>exempt</code> property indicates that the [=publication resource=]
+							is an [=exempt resource=] (e.g., is used as script input or is included in the
+							[=EPUB container=] for non-rendering purposes).</p>
+						<p>If [=EPUB creators=] do not set this property, acknowledging the resources are
+							included by design, reading systems and [=EPUB conformance checkers=] may flag the
+							resources as unused if they cannot find references to them.</p>
+					</td>
+				</tr>
+				<tr>
+					<th>Applies to:</th>
+					<td>All publication resources that meet the <a href="#confreq-foreign-no-fallback">exempt
+						resources condition</a> that allows unreferenced resources.</td>
+				</tr>
+				<tr>
+					<th>Cardinality:</th>
+					<td>
+						<code>Zero or more</code>
+					</td>
+				</tr>
+			</tbody>
+		</table>
+	</section>
+	
 	<section id="sec-mathml">
 		<h4>mathml</h4>