diff --git a/Tools/autotest/param_metadata/param.py b/Tools/autotest/param_metadata/param.py
index 4a3b99b8bd..678c1bc612 100644
--- a/Tools/autotest/param_metadata/param.py
+++ b/Tools/autotest/param_metadata/param.py
@@ -108,6 +108,7 @@ known_units = {
              'octal'   : 'octal'                 ,
              'RPM'     : 'Revolutions Per Minute',
              'kg/m/m'  : 'kilograms per square meter', # metre is the SI unit name, meter is the american spelling of it
+             'kg/m.m'  : 'kilogram per meter squared'
              }
 
 required_param_fields = [