diff --git a/index.html b/index.html
index 46bf5c02..072cb9de 100644
--- a/index.html
+++ b/index.html
@@ -920,6 +920,16 @@ <h2>RDF Serialization/Deserialization</h2>
 
   <section>
     <h2>Processor Levels</h2>
+
+    <!--
+      ---------------- IMPORTANT WARNING ----------------
+      This section is duplicated (with a few adaptations)
+      in other JSON-LD specifications. Since these
+      definitions are normative, it is important to
+      reflect any change in the other documents.
+      ---------------------------------------------------
+    -->
+
     <p>JSON-LD mostly uses the JSON syntax [[RFC8259]] along with
       various micro-syntaxes based on XML Schema datatypes [[XMLSCHEMA11-2]].
       However, it has become increasingly common to include JSON within
@@ -929,11 +939,11 @@ <h2>Processor Levels</h2>
       As not all processors operate in an environment which can include HTML,
       this specification describes various categories of JSON-LD processors.</p>
 
-    <p>A <dfn>pure JSON Processor</dfn> only requires the use of a
+    <p>A <dfn data-cite="JSON-LD11#pure-json-processor">pure JSON Processor</dfn> only requires the use of a
       JSON processor and is restricted to processing documents retrieved
       with a JSON content type (e.g., <code>application/ld+json</code> or other JSON type).</p>
 
-    <p>A <dfn>full Processor</dfn> is capable of processing JSON-LD embedded in HTML,
+    <p>A <dfn data-cite="JSON-LD11#full-processor">full Processor</dfn> is capable of processing JSON-LD embedded in HTML,
       in addition to the capabilities of a <a>pure JSON Processor</a>.</p>
 
     <section class="informative">
@@ -942,7 +952,7 @@ <h3>Additional Processor Levels</h3>
       <p>In addition to the normatively defined processor levels, an additional processor
         level is defined for reference.</p>
 
-      <p>A <dfn>event-based JSON Processor</dfn> processes a stream of characters
+      <p>A <dfn data-cite="JSON-LD11#event-based-json-processor">event-based JSON Processor</dfn> processes a stream of characters
         expecting an event after each syntactic element is encountered.
         Such processors are sensitive to the order of the members of <a>JSON objects</a>,
         which can have a performance impact if the members of <a>JSON objects</a> are encountered in an unexpected order.