diff --git a/nixos/doc/manual/man-nixos-install.xml b/nixos/doc/manual/man-nixos-install.xml
index 91542d37cbd5..eb6680b65677 100644
--- a/nixos/doc/manual/man-nixos-install.xml
+++ b/nixos/doc/manual/man-nixos-install.xml
@@ -69,9 +69,14 @@
    </arg>
 
    <arg>
-    <arg choice='plain'>
-     <option>--no-root-passwd</option>
-    </arg>
+    <group choice='req'>
+     <arg choice='plain'>
+      <option>--no-root-password</option>
+     </arg>
+     <arg choice='plain'>
+      <option>--no-root-passwd</option>
+     </arg>
+    </group>
    </arg>
 
    <arg>
@@ -157,7 +162,7 @@
     <listitem>
      <para>
       It prompts you for a password for the root account (unless
-      <option>--no-root-passwd</option> is specified).
+      <option>--no-root-password</option> is specified).
      </para>
     </listitem>
    </itemizedlist>
diff --git a/nixos/modules/installer/tools/nixos-install.sh b/nixos/modules/installer/tools/nixos-install.sh
index ea9667995e13..135ee1305f12 100644
--- a/nixos/modules/installer/tools/nixos-install.sh
+++ b/nixos/modules/installer/tools/nixos-install.sh
@@ -58,7 +58,7 @@ while [ "$#" -gt 0 ]; do
         --no-channel-copy)
             noChannelCopy=1
             ;;
-        --no-root-passwd)
+        --no-root-password|--no-root-passwd)
             noRootPasswd=1
             ;;
         --no-bootloader)