diff --git a/spec/units.yaml b/spec/units.yaml
index 5f32a026..ee0c9ab3 100644
--- a/spec/units.yaml
+++ b/spec/units.yaml
@@ -58,7 +58,7 @@ cm/s^2:
 # Volume
 
 ml:
-  description: Volume measured in milliliters
+  definition: Volume measured in milliliters
   unit: milliliter
   quantity: volume
   allowed-datatypes: ['numeric']
@@ -138,7 +138,7 @@ g:
   allowed-datatypes: ['numeric']
 kg:
   definition: Mass measured in kilograms
-  label: kilogram
+  unit: kilogram
   quantity: mass
   allowed-datatypes: ['numeric']
 lbs:
@@ -205,7 +205,7 @@ weeks:
   allowed-datatypes: ['numeric']
 months:
   definition: Duration measured in months
-  units: months
+  unit: months
   quantity: duration
   allowed-datatypes: ['numeric']
 years: