diff --git a/docs/running_psalm/plugins/plugins_type_system.md b/docs/running_psalm/plugins/plugins_type_system.md
index 0589309d3..28e1ef9e8 100644
--- a/docs/running_psalm/plugins/plugins_type_system.md
+++ b/docs/running_psalm/plugins/plugins_type_system.md
@@ -59,6 +59,10 @@ The classes are as follows:
 
 `TTemplateValueOf` - Represents the type used when using TValueOfArray when the type of the array is a template
 
+`TPropertiesOf` - Represents properties and their types of a class as a keyed array (e.g. `properties-of<MyClass>`)
+
+`TTemplatePropertiesOf` - Represents the type used when using TPropertiesOf when type of the class is a template
+
 `TTypeAlias` - To be documented
 
 ### Scalar supertype
diff --git a/src/Psalm/Type/Atomic/TPropertiesOf.php b/src/Psalm/Type/Atomic/TPropertiesOf.php
index bf3970b55..b3e009c6c 100644
--- a/src/Psalm/Type/Atomic/TPropertiesOf.php
+++ b/src/Psalm/Type/Atomic/TPropertiesOf.php
@@ -5,7 +5,8 @@ namespace Psalm\Type\Atomic;
 use Psalm\Type\Atomic;
 
 /**
- * Type that resolves to property names of a class/interface.
+ * Type that resolves to a keyed-array with properties of a class as keys and
+ * their apropriate types as values.
  *
  * @psalm-type TokenName = 'properties-of'|'public-properties-of'|'protected-properties-of'|'private-properties-of'
  */