diff --git a/act-rules-format/act-rules-format.bs b/act-rules-format/act-rules-format.bs
index d7af3fc..71fcfe3 100644
--- a/act-rules-format/act-rules-format.bs
+++ b/act-rules-format/act-rules-format.bs
@@ -1110,7 +1110,7 @@ Changes Since [ACT Rules Format 1.0](https://www.w3.org/TR/act-rules-format-1.0/
 ---------------
 
 <ul>
-  <li><strong>4. Rule Structure</strong> Accessibility Support and Assumptions section are now subsections of Background.</li>
+  <li><strong>4. Rule Structure</strong> Accessibility Support and Assumptions sections are now subsections of Background.</li>
   <li><strong>4.4. Accessibility Requirements Mapping</strong> Accessibility requirements are now categorized as either Conformance requirements or Secondary requirements.</li>
   <li><strong>4.6 Applicability</strong> Subjective applicability statements are now allowed. Objective and plain language requirements have been reduced to <em class="rfc2119">should</em> instead of <em class="rfc2119">must</em>.</li>
   <li><strong>4.8. Background</strong> New optional Related Rules and Other Resources subsections have been added</li>