diff --git a/FAQ.md b/FAQ.md
index 72bdbe19a3..393e3344db 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -2769,8 +2769,8 @@ The following extra variables are available:
 
 The following extra operators are available:
 
-* *contains* (contains substring)
-* *matches* (matches regex)
+* *contains* (string/array of strings contains substring)
+* *matches* (string/array of strings matches regex)
 
 The following extra functions are available:
 
diff --git a/index.html b/index.html
index 63ffa90f2a..435c983671 100644
--- a/index.html
+++ b/index.html
@@ -1510,8 +1510,8 @@ X-Google-Original-From: Somebody &lt;somebody+extra@example.org&gt;</code></pre>
 </ul>
 <p>The following extra operators are available:</p>
 <ul>
-<li><em>contains</em> (contains substring)</li>
-<li><em>matches</em> (matches regex)</li>
+<li><em>contains</em> (string/array of strings contains substring)</li>
+<li><em>matches</em> (string/array of strings matches regex)</li>
 </ul>
 <p>The following extra functions are available:</p>
 <ul>