diff --git a/doc/installation.xml b/doc/installation.xml
index c46c7cd5b..ef720c606 100644
--- a/doc/installation.xml
+++ b/doc/installation.xml
@@ -159,7 +159,7 @@ $HOME/.nix-profile/etc/profile.d/hm-session-vars.sh
    a Home Manager channel, for example
   </para>
 
-<screen>
+<screen language="console">
 <prompt>#</prompt> <userinput>nix-channel --add https://github.com/rycee/home-manager/archive/master.tar.gz home-manager</userinput>
 <prompt>#</prompt> <userinput>nix-channel --update</userinput>
 </screen>
@@ -168,7 +168,7 @@ $HOME/.nix-profile/etc/profile.d/hm-session-vars.sh
    if you are following Nixpkgs master or an unstable channel and
   </para>
 
-<screen>
+<screen language="console">
 <prompt>#</prompt> <userinput>nix-channel --add https://github.com/rycee/home-manager/archive/release-20.03.tar.gz home-manager</userinput>
 <prompt>#</prompt> <userinput>nix-channel --update</userinput>
 </screen>
@@ -258,7 +258,7 @@ home-manager.useGlobalPkgs = true;
    a Home Manager channel, for example
   </para>
 
-<screen>
+<screen language="console">
 <prompt>#</prompt> <userinput>nix-channel --add https://github.com/rycee/home-manager/archive/master.tar.gz home-manager</userinput>
 <prompt>#</prompt> <userinput>nix-channel --update</userinput>
 </screen>
@@ -267,7 +267,7 @@ home-manager.useGlobalPkgs = true;
    if you are following Nixpkgs master or an unstable channel and
   </para>
 
-<screen>
+<screen language="console">
 <prompt>#</prompt> <userinput>nix-channel --add https://github.com/rycee/home-manager/archive/release-20.03.tar.gz home-manager</userinput>
 <prompt>#</prompt> <userinput>nix-channel --update</userinput>
 </screen>