diff --git a/doc/manual/command-ref/nix-shell.xml b/doc/manual/command-ref/nix-shell.xml
index 6f00e28ca..c64c93ec3 100644
--- a/doc/manual/command-ref/nix-shell.xml
+++ b/doc/manual/command-ref/nix-shell.xml
@@ -267,7 +267,7 @@ dependencies in Nixpkgs.</para>
 
 <para>The lines starting with <literal>#! nix-shell</literal> specify
 <command>nix-shell</command> options (see above). Note that you cannot
-write <literal>#1 /usr/bin/env nix-shell -i ...</literal> because
+write <literal>#! /usr/bin/env nix-shell -i ...</literal> because
 many operating systems only allow one argument in
 <literal>#!</literal> lines.</para>