diff --git a/source b/source
index 0a1377b6c92..79972bf6edc 100644
--- a/source
+++ b/source
@@ -69754,7 +69754,7 @@ Demos:
 
     <p>Gives a relationship to another entity.</p>
 
-    <p>The <span data-x="concept-property-value">value</span> must an <span
+    <p>The <span data-x="concept-property-value">value</span> must be an <span
     data-x="concept-item">item</span> with one <code data-x="md-vcard-related-url">url</code>
     property and one <code data-x="md-vcard-related-rel">rel</code> properties.</p>