diff --git a/docs/property-mappings/expression.md b/docs/property-mappings/expression.md
index a25ee2aad..13cd02262 100644
--- a/docs/property-mappings/expression.md
+++ b/docs/property-mappings/expression.md
@@ -1,9 +1,9 @@
 # Property Mapping Expressions
 
-The property mapping should return a value that is expected by the Provider/Source. What types are supported, is documented in the individual Provider/Source. Returning `None` is always accepted, this simply skips this mapping.
+The property mapping should return a value that is expected by the Provider/Source. Supported types are documented in the individual Provider/Source. Returning `None` is always accepted and would simply skip the mapping for which `None` was returned.
 
 ### Context Variables
 
-- `user`: The current user, this might be `None` if there is no contextual user. ([ref](../expressions/reference/user-object.md))
-- `request`: The current request, this might be `None` if there is no contextual request. ([ref](https://docs.djangoproject.com/en/3.0/ref/request-response/#httprequest-objects))
-- Arbitrary other arguments given by the provider, this is documented on the Provider/Source.
+- `user`: The current user. This may be `None` if there is no contextual user. ([ref](../expressions/reference/user-object.md))
+- `request`: The current request. This may be `None` if there is no contextual request. ([ref](https://docs.djangoproject.com/en/3.0/ref/request-response/#httprequest-objects))
+- Other arbitrary arguments given by the provider, this is documented on the Provider/Source.