diff --git a/docs/content/author-bundles.md b/docs/content/author-bundles.md
index 491d5ff6c..964bd6366 100644
--- a/docs/content/author-bundles.md
+++ b/docs/content/author-bundles.md
@@ -96,6 +96,14 @@ See [Using Mixins](/use-mixins) to learn more about how mixins work.
 Parameters are part of the [CNAB Spec](https://github.com/cnabio/cnab-spec/blob/master/101-bundle-json.md#parameters) and
 allow you to pass in configuration values when you execute the bundle.
 
+### Parameter Types
+
+* string
+* integer
+* number
+* boolean
+* [file](#file-parameters)
+
 Learn more about [how parameters work in Porter](/parameters/).
 
 ```yaml
diff --git a/docs/content/parameters.md b/docs/content/parameters.md
index 488f0386c..a90106703 100644
--- a/docs/content/parameters.md
+++ b/docs/content/parameters.md
@@ -5,11 +5,13 @@ aliases:
 - /how-parameters-work/
 ---
 
-When you are authoring a bundle, you can define what parameters your bundle
-requires such as username and password values for a backing database, or the
-region that a certain resource should be deployed in, etc. Then in your
-action's steps you can reference the parameters using porter's template
-language `{{ bundle.parameters.db_name }}`.
+When you are authoring a bundle, you can define parameters that are required by
+your bundle. These parameters are restricted to a list of [allowable data
+types](/author-bundles/#parameter-types) and are used to define parameters such as
+username and password values for a backing database, or the region that a
+certain resource should be deployed in, etc. Then in your action's steps you can
+reference the parameters using porter's template language `{{
+bundle.parameters.db_name }}`.
 
 Parameter values are resolved from a combination of supplied parameter set
 files, user-specified overrides and defaults defined by the bundle itself.