diff --git a/README.md b/README.md
index 286be7f..c17b647 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,7 @@ czml3 aims to make the process of writing CZML files in Python easy by:
 - Cooercion of data to their required format
 - Forbidding unrecognised properties
 - Creating minimal CZML files
+- Performant JSON serialisation
 
 ## Insallation
 You can install czml3 using pip:
diff --git a/docs/index.rst b/docs/index.rst
index d0a43c9..b9fb718 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -16,6 +16,7 @@ czml3 aims to make the process of writing CZML files in Python easy by:
 * Cooercion of data to their required format
 * Forbidding unrecognised properties
 * Creating minimal CZML files
+* Performant JSON serialisation
 
 .. toctree::
    :maxdepth: 2
diff --git a/docs/user/features.rst b/docs/user/features.rst
index 565c114..0c18c32 100644
--- a/docs/user/features.rst
+++ b/docs/user/features.rst
@@ -1,24 +1,31 @@
 Features
 ========
 
-The goal of czml3 is to make the process of writing CZML files in Python easy. This page details the features that allow czml3 to achieve this goal.
+czml3 is built upon `pydantic <https://docs.pydantic.dev/latest/>`_ and leverages a lot of it's capabilities to achieve this goal.
 
 Type Checking
 -------------
 
-All classes enforces type checking on the inputs. This ensures that the data is in the correct format before it is written to the CZML file.
+Inputs to classes are type checked, which ensures that the data is in the correct format before it is written to the CZML file.
 
 Cooercion of Data
 -----------------
 
-czml3 `coerces data to their right type <https://docs.pydantic.dev/latest/why/#json-schema>`_. See Example 2 in  :ref:`examples-label`.
+Inputted data to classes that is not of the specified type is `coerced to their right type <https://docs.pydantic.dev/latest/why/#json-schema>`_. See Example 2 in  :ref:`examples-label`.
 
 Forbid Unrecognised Properties
 ------------------------------
 
-czml3 raises an error if a model (class) receives an unrecognised input.
+Unrecognised inputs to classes are forbidden, which ensures the CZML document contains only recognised and valid fields.
+
+If a valid property of a czml3 class is missing then please `open an issue <https://github.com/Stoops-ML/czml3/issues>`_.
 
 Minimal CZML File Creation
 --------------------------
 
-czml3 will remove all fields that are not set (i.e. ``None``). This ensures that the CZML file is as small as possible.
+czml3 will remove all fields that are not set (i.e. ``None``), which ensures that the CZML file is as small as possible.
+
+Performant JSON Serialisation
+--------------------------
+
+Pydantic is very fast at JSON serialisation. See `here <https://janhendrikewers.uk/pydantic-1-vs-2-a-benchmark-test>`_ for a breakdown.