diff --git a/.changes/next-release/feature-AWSIdentityandAccessManagement-ad451d8.json b/.changes/next-release/feature-AWSIdentityandAccessManagement-ad451d8.json
new file mode 100644
index 000000000000..4abe1cca03fc
--- /dev/null
+++ b/.changes/next-release/feature-AWSIdentityandAccessManagement-ad451d8.json
@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "AWS Identity and Access Management",
+    "contributor": "",
+    "description": "Documentation updates for AWS Identity and Access Management (IAM)."
+}
diff --git a/services/iam/src/main/resources/codegen-resources/service-2.json b/services/iam/src/main/resources/codegen-resources/service-2.json
index 4e022879cbce..25610a7f6935 100644
--- a/services/iam/src/main/resources/codegen-resources/service-2.json
+++ b/services/iam/src/main/resources/codegen-resources/service-2.json
@@ -3118,7 +3118,7 @@
         },
         "PolicyDocument":{
           "shape":"policyDocumentType",
-          "documentation":"<p>The JSON policy document that you want to use as the content for the new policy.</p> <p>You must provide policies in JSON format in IAM. However, for AWS CloudFormation templates formatted in YAML, you can provide the policy in JSON or YAML format. AWS CloudFormation always converts a YAML policy to JSON format before submitting it to IAM.</p> <p>The <a href=\"http://wikipedia.org/wiki/regex\">regex pattern</a> used to validate this parameter is a string of characters consisting of the following:</p> <ul> <li> <p>Any printable ASCII character ranging from the space character (<code>\\u0020</code>) through the end of the ASCII character range</p> </li> <li> <p>The printable characters in the Basic Latin and Latin-1 Supplement character set (through <code>\\u00FF</code>)</p> </li> <li> <p>The special characters tab (<code>\\u0009</code>), line feed (<code>\\u000A</code>), and carriage return (<code>\\u000D</code>)</p> </li> </ul>"
+          "documentation":"<p>The JSON policy document that you want to use as the content for the new policy.</p> <p>You must provide policies in JSON format in IAM. However, for AWS CloudFormation templates formatted in YAML, you can provide the policy in JSON or YAML format. AWS CloudFormation always converts a YAML policy to JSON format before submitting it to IAM.</p> <p>To learn more about JSON policy grammar, see <a href=\"https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_grammar.html\">Grammar of the IAM JSON policy language</a> in the <i>IAM User Guide</i>. </p> <p>The <a href=\"http://wikipedia.org/wiki/regex\">regex pattern</a> used to validate this parameter is a string of characters consisting of the following:</p> <ul> <li> <p>Any printable ASCII character ranging from the space character (<code>\\u0020</code>) through the end of the ASCII character range</p> </li> <li> <p>The printable characters in the Basic Latin and Latin-1 Supplement character set (through <code>\\u00FF</code>)</p> </li> <li> <p>The special characters tab (<code>\\u0009</code>), line feed (<code>\\u000A</code>), and carriage return (<code>\\u000D</code>)</p> </li> </ul>"
         },
         "Description":{
           "shape":"policyDescriptionType",