diff --git a/nixos/doc/manual/administration/boot-problems.xml b/nixos/doc/manual/administration/boot-problems.xml
index abde448fcba..5fa0b29e6d6 100644
--- a/nixos/doc/manual/administration/boot-problems.xml
+++ b/nixos/doc/manual/administration/boot-problems.xml
@@ -44,7 +44,7 @@
     </term>
     <listitem>
      <para>
-      Like <literal>boot.debug1</literal>, but with some more devices loaded.
+      Like <literal>boot.debug1</literal>, but runs stage1 until kernel modules are loaded and device nodes are created.
       This may help with e.g. making the keyboard work.
      </para>
     </listitem>