diff --git a/Rules-for-adding-new-device-types.md b/Rules-for-adding-new-device-types.md
index b846267..3d2fb74 100644
--- a/Rules-for-adding-new-device-types.md
+++ b/Rules-for-adding-new-device-types.md
@@ -10,7 +10,7 @@ Steps for adding a new device type:
 6. Update the manpages.
 
 Devices shall be subclasses of PrimaryDevice or ModeSenseDevice. Only devices backed by image files shall be subclasses of the Disk class.
-See the implementations of the Host Services (SCHS) and the SCSI Printer (SCLP) for a device implementations with low complexity.
+See the implementations of the Host Services (SCHS) and the SCSI Printer (SCLP) for device implementations with low complexity.
 
 ## Clients