diff --git a/build/docs/content/08-filename.md b/build/docs/content/08-filename.md
index d330d121..225cb7b5 100644
--- a/build/docs/content/08-filename.md
+++ b/build/docs/content/08-filename.md
@@ -11,7 +11,7 @@ Otherwise a random filename is used.
 > However, you may hijack the response from the API or store the resulting PDF
 > using a custom filename.
 >
-> **Attention:** this feature does not work if a form field `webhookURL` is given.
+> **Attention:** this feature does not work if the form field `webhookURL` is given.
 
 ## Examples
 
diff --git a/docs/index.html b/docs/index.html
index aeb4d6ea..7efaf391 100755
--- a/docs/index.html
+++ b/docs/index.html
@@ -916,7 +916,7 @@ Otherwise a random filename is used.</p>
 However, you may hijack the response from the API or store the resulting PDF
 using a custom filename.</p>
 
-<p><strong>Attention:</strong> this feature does not work if a form field <code>webhookURL</code> is given.</p>
+<p><strong>Attention:</strong> this feature does not work if the form field <code>webhookURL</code> is given.</p>
 </blockquote>
 
 <h2 class="Heading"><a class="Anchor" aria-hidden="true" id="filename.examples" href="#filename.examples">