diff --git a/doc/manual/expressions/writing-nix-expressions.xml b/doc/manual/expressions/writing-nix-expressions.xml
index 6d64f24cd..6b797c200 100644
--- a/doc/manual/expressions/writing-nix-expressions.xml
+++ b/doc/manual/expressions/writing-nix-expressions.xml
@@ -4,7 +4,7 @@
       version="5.0"
       xml:id='chap-writing-nix-expressions'>
 
-<title>Nix Expressions</title>
+<title>Writing Nix Expressions</title>
 
 <partintro>
 <para>This chapter shows you how to write Nix expressions, which 
diff --git a/doc/manual/introduction/about-nix.xml b/doc/manual/introduction/about-nix.xml
index 0346934b0..4860b3d38 100644
--- a/doc/manual/introduction/about-nix.xml
+++ b/doc/manual/introduction/about-nix.xml
@@ -4,7 +4,7 @@
       version="5.0"
       xml:id="ch-about-nix">
 
-<title>About Nix</title>
+<title>Introduction</title>
 
 <para>Nix is a <emphasis>purely functional package manager</emphasis>.
 This means that it treats packages like values in purely functional