diff --git a/Docs/README.commands b/Docs/README.commands
index 7ca81ccbb..991c54e9a 100644
--- a/Docs/README.commands
+++ b/Docs/README.commands
@@ -173,6 +173,15 @@ property-assign - assign a value to a property
   value: the new value for the property; or
   property[1]: the name of the property holding the new value.
 
+property-interpolate - assign a value to a property, interpolated 
+                       over time
+  property[0]: the name of the property that will get the new value
+               and defines the starting point of the interpolation
+  value:       the new value for the property; or
+  property[1]: the name of the property holding the new value.
+  time:        the time in seconds it takes for the transition from the
+               old value to the new value of property[0]
+
 property-adjust - adjust the value of a property
   property: the name of the property to increment or decrement
   step: the amount of the increment or decrement (defaults to 0)