Heiko's suggestion

docs/odata-protocol/odata-protocol.html

@@ -2175,7 +2175,7 @@ <h3 id="1129-resolving-an-entity-id"><a id="ResolvinganEntityId" href="#Resolvin
 <h3 id="11210-requesting-the-number-of-items-in-a-collection"><a id="RequestingtheNumberofItemsinaCollection" href="#RequestingtheNumberofItemsinaCollection">11.2.10 Requesting the Number of Items in a Collection</a></h3>
 </summary>
 <p>To request only the number of items of a collection of entities or items of a collection-valued property, the client issues a <code>GET</code> request with <code>/$count</code> appended to the resource path of the collection.</p>
-<p>On success, the response body MUST contain the exact count of items matching the request after applying any <a href="#SystemQueryOptionfilter"><code>$filter</code></a> or <a href="#SystemQueryOptionsearch"><code>$search</code></a> system query options, formatted as a simple primitive integer value with media type <code>text/plain</code> without <code>charset</code> parameter, and the response body following rule <code>1*DIGIT</code>.</p>
+<p>On success, the response body MUST contain the exact count of items matching the request after applying any <a href="#SystemQueryOptionfilter"><code>$filter</code></a> or <a href="#SystemQueryOptionsearch"><code>$search</code></a> system query options, formatted as a simple primitive integer value with media type <code>text/plain</code> without <code>charset</code> parameter, and the response body following rule <code>1*DIGIT</code>, see <a href="#ODataABNF">OData-ABNF</a>.</p>
 <p>Clients SHOULD NOT combine the system query options <a href="#SystemQueryOptiontop"><code>$top</code></a>, <a href="#SystemQueryOptionskip"><code>$skip</code></a>, <a href="#SystemQueryOptionorderby"><code>$orderby</code></a>, <a href="#SystemQueryOptionexpand"><code>$expand</code></a>, and <a href="#SystemQueryOptionformat"><code>$format</code></a> with the path suffix <code>/$count</code>. The result of such a request is undefined.</p>
 <div class="example">
 <p>Example 69: return the number of products in the Products entity set</p>

docs/odata-protocol/odata-protocol.md

@@ -3713,7 +3713,7 @@ matching the request after applying any
 [`$filter`](#SystemQueryOptionfilter) or
 [`$search`](#SystemQueryOptionsearch) system query options, formatted as
 a simple primitive integer value with media type `text/plain` without `charset` parameter,
-and the response body following rule `1*DIGIT`.
+and the response body following rule `1*DIGIT`, see [OData-ABNF](#ODataABNF).
 
 Clients SHOULD NOT combine the system query options
 [`$top`](#SystemQueryOptiontop),

odata-protocol/11 Data Service Requests.md

@@ -1149,7 +1149,7 @@ matching the request after applying any
 [`$filter`](#SystemQueryOptionfilter) or
 [`$search`](#SystemQueryOptionsearch) system query options, formatted as
 a simple primitive integer value with media type `text/plain` without `charset` parameter,
-and the response body following rule `1*DIGIT`.
+and the response body following rule `1*DIGIT`, see [OData-ABNF](#ODataABNF).
 
 Clients SHOULD NOT combine the system query options
 [`$top`](#SystemQueryOptiontop),