diff --git a/doc/functions.xml b/doc/functions.xml
index 333ed65986b..b710d30e108 100644
--- a/doc/functions.xml
+++ b/doc/functions.xml
@@ -10,24 +10,7 @@
 
  <xi:include href="functions/overrides.xml" />
  <xi:include href="functions/generators.xml" />
- <section xml:id="sec-debug">
-  <title>Debugging Nix Expressions</title>
-
-  <para>
-   Nix is a unityped, dynamic language, this means every value can potentially
-   appear anywhere. Since it is also non-strict, evaluation order and what
-   ultimately is evaluated might surprise you. Therefore it is important to be
-   able to debug nix expressions.
-  </para>
-
-  <para>
-   In the <literal>lib/debug.nix</literal> file you will find a number of
-   functions that help (pretty-)printing values while evaluation is runnnig.
-   You can even specify how deep these values should be printed recursively,
-   and transform them on the fly. Please consult the docstrings in
-   <literal>lib/debug.nix</literal> for usage information.
-  </para>
- </section>
+ <xi:include href="functions/debug.xml" />
  <section xml:id="sec-fhs-environments">
   <title>buildFHSUserEnv</title>
 
diff --git a/doc/functions/debug.xml b/doc/functions/debug.xml
new file mode 100644
index 00000000000..272bdf55513
--- /dev/null
+++ b/doc/functions/debug.xml
@@ -0,0 +1,21 @@
+<section xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xmlns:xi="http://www.w3.org/2001/XInclude"
+         xml:id="sec-debug">
+  <title>Debugging Nix Expressions</title>
+
+  <para>
+   Nix is a unityped, dynamic language, this means every value can potentially
+   appear anywhere. Since it is also non-strict, evaluation order and what
+   ultimately is evaluated might surprise you. Therefore it is important to be
+   able to debug nix expressions.
+  </para>
+
+  <para>
+   In the <literal>lib/debug.nix</literal> file you will find a number of
+   functions that help (pretty-)printing values while evaluation is runnnig.
+   You can even specify how deep these values should be printed recursively,
+   and transform them on the fly. Please consult the docstrings in
+   <literal>lib/debug.nix</literal> for usage information.
+  </para>
+ </section>