diff --git a/website/docs/d/iam_policy_document.html.markdown b/website/docs/d/iam_policy_document.html.markdown
index 9fc9130e2d8..dc815f5b799 100644
--- a/website/docs/d/iam_policy_document.html.markdown
+++ b/website/docs/d/iam_policy_document.html.markdown
@@ -421,11 +421,14 @@ data "aws_iam_policy_document" "combined" {
 
 The following arguments are optional:
 
-* `override_json` (Optional) - IAM policy document whose statements with non-blank `sid`s will override statements with the same `sid` in the exported document including any defined by the `override_policy_documents` argument. Statements without a `sid` cannot be overridden.
-* `override_policy_documents` (Optional) - List of IAM policy documents that are merged together into the exported document, potentially overriding previously defined statements with the same `sid`s.
+* `override_json` (Optional) - IAM policy document whose statements with non-blank `sid`s will override statements with the same `sid` from documents assigned to the `source_json`, `source_policy_documents`, and `override_policy_documents` arguments. Non-overriding statements will be added to the exported document.
+
+~> **NOTE:** Statements without a `sid` cannot be overridden. In other words, a statement without a `sid` from documents assigned to the `source_json` or `source_policy_documents` arguments cannot be overridden by statements from documents assigned to the `override_json` or `override_policy_documents` arguments.
+
+* `override_policy_documents` (Optional) - List of IAM policy documents that are merged together into the exported document. In merging, statements with non-blank `sid`s will override statements with the same `sid` from earlier documents in the list. Statements with non-blank `sid`s will also override statements with the same `sid` from documents provided in the `source_json` and `source_policy_documents` arguments.  Non-overriding statements will be added to the exported document.
 * `policy_id` (Optional) - ID for the policy document.
-* `source_json` (Optional) - IAM policy document used as a base for the exported policy document.
-* `source_policy_documents` (Optional) - List of IAM policy documents that are merged together into the exported document. Statements defined in `source_policy_documents` or `source_json` must have unique `sid`s. Override statements with the same `sid` will override source statements. Statements without a `sid` cannot be overridden.
+* `source_json` (Optional) - IAM policy document used as a base for the exported policy document. Statements with the same `sid` from documents assigned to the `override_json` and `override_policy_documents` arguments will override source statements.
+* `source_policy_documents` (Optional) - List of IAM policy documents that are merged together into the exported document. Statements defined in `source_policy_documents` or `source_json` must have unique `sid`s. Statements with the same `sid` from documents assigned to the `override_json` and `override_policy_documents` arguments will override source statements.
 * `statement` (Optional) - Configuration block for a policy statement. Detailed below.
 * `version` (Optional) - IAM policy document version. Valid values are `2008-10-17` and `2012-10-17`. Defaults to `2012-10-17`. For more information, see the [AWS IAM User Guide](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_version.html).