diff --git a/nixos/doc/manual/configuration/user-mgmt.xml b/nixos/doc/manual/configuration/user-mgmt.xml
index 40362fbbb23..63174205927 100644
--- a/nixos/doc/manual/configuration/user-mgmt.xml
+++ b/nixos/doc/manual/configuration/user-mgmt.xml
@@ -65,6 +65,14 @@ account named <literal>alice</literal>:
 <screen>
 $ useradd -m alice</screen>
 
+To make all nix tools available to this new user use `su - USER` which 
+opens a login shell (==shell that loads the profile) for given user. 
+This will create the ~/.nix-defexpr symlink. So run:
+
+<screen>
+$ su - alice -c "true"</screen>
+
+
 The flag <option>-m</option> causes the creation of a home directory
 for the new user, which is generally what you want.  The user does not
 have an initial password and therefore cannot log in.  A password can