docbook: Add missing "of" from last commit.
diff --git a/doc/package/ebuild/eapi/4.docbook b/doc/package/ebuild/eapi/4.docbook
index 24471f1..c379d11 100644
--- a/doc/package/ebuild/eapi/4.docbook
+++ b/doc/package/ebuild/eapi/4.docbook
@@ -93,7 +93,7 @@
 <para>
 The econf helper now adds --disable-dependency-tracking to the
 configure arguments if the string disable-dependency-tracking
-occurs in the output configure --help.
+occurs in the output of configure --help.
 </para>
 </section>
 <section id='package-ebuild-eapi-4-helpers-use-with-enable-empty-third-arg'>