diff --git a/.gitignore b/.gitignore
index cf9d800..1c879c0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /tuned-switcher-0.2.0.tar.gz
 /tuned-switcher-0.3.0.tar.gz
+/tuned-switcher-0.4.0.tar.gz
diff --git a/sources b/sources
index 7564b0b..a03f41f 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (tuned-switcher-0.3.0.tar.gz) = 470a585a1bcc83c5cef75e2320b9ed12422370441da1368e9927e8edcc2472f16b708fd19984529456623c1573b12409dd43876f3fcb6014cfd214cad4295d61
+SHA512 (tuned-switcher-0.4.0.tar.gz) = 80c15b324bc6a5ea33be231659f6dbf31c8697ed8335ed7fa7810473b1c429bf0fd0847e04b0a4e654dbea370dcf6891c2d3e24ac4f03deedb7ba1c850ff3343
diff --git a/tuned-switcher.spec b/tuned-switcher.spec
index cf9ca44..70cbc08 100644
--- a/tuned-switcher.spec
+++ b/tuned-switcher.spec
@@ -1,7 +1,7 @@
 %undefine __cmake_in_source_build
 
 Name: tuned-switcher
-Version: 0.3.0
+Version: 0.4.0
 Release: 1%{?dist}
 
 # Main code - GPLv3+.
@@ -22,6 +22,7 @@ BuildRequires: desktop-file-utils
 BuildRequires: gcc-c++
 BuildRequires: libappstream-glib
 BuildRequires: ninja-build
+BuildRequires: pandoc
 
 Requires: hicolor-icon-theme
 Requires: tuned
@@ -38,7 +39,8 @@ In order to use this program, a daemon must be installed on your system.
 %build
 %cmake -G Ninja \
     -DCMAKE_BUILD_TYPE=Release \
-    -DBUILD_DOCS:BOOL=OFF
+    -DBUILD_DOCS:BOOL=OFF \
+    -DBUILD_MANPAGE:BOOL=ON
 %cmake_build
 
 %check
@@ -56,8 +58,12 @@ desktop-file-validate %{buildroot}%{_datadir}/applications/*.desktop
 %{_datadir}/applications/*.desktop
 %{_datadir}/icons/hicolor/*/apps/*.*
 %{_metainfodir}/*.metainfo.xml
+%{_mandir}/man1/%{name}.1*
 
 %changelog
+* Sat Jul 10 2021 Vitaly Zaitsev <vitaly@easycoding.org> - 0.4.0-1
+- Updated to version 0.4.0.
+
 * Thu Jul 01 2021 Vitaly Zaitsev <vitaly@easycoding.org> - 0.3.0-1
 - Updated to version 0.3.0.