diff --git a/README.md b/README.md
index ca73708..e4ee48f 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,12 @@ Previous versions of this application featured an optional [CloudFront](https://
 
 While the CloudFront-enabled version of the application is no longer available in the Serverless Application Repository, the newly created [`examples`](./examples/README.md) directory includes sample [CloudFormation](https://aws.amazon.com/cloudformation/) templates and [Terraform](https://terraform.io/) manifests showing how to deploy the IIIF service as part of a larger application/infrastructure stack.
 
+### Breaking Changes from Version 4.x
+
+- The value of the `SharpLayer` variable must now be one of `INTERNAL`, `JP2`, or a valid Lambda layer ARN in the same region the 
+  application is being deployed in. The new default is `JP2`, which behaves the same as the former default (empty string). The new
+  value, `INTERNAL`, uses the `sharp` and `libvips` dependencies compiled into the application itself.
+
 ## Description
 
 A IIIF [2.1](https://iiif.io/api/image/2.1/) and [3.0](https://iiif.io/api/image/3.0/) Image API compliant server written as an [AWS Serverless Application](https://aws.amazon.com/serverless/sam/).
@@ -19,7 +25,6 @@ A IIIF [2.1](https://iiif.io/api/image/2.1/) and [3.0](https://iiif.io/api/image
 * A simple [Lambda Function](https://aws.amazon.com/lambda/) wrapper for the [iiif-processor](https://www.npmjs.com/package/iiif-processor) module.
 * A [Lambda Function URL](https://docs.aws.amazon.com/lambda/latest/dg/lambda-urls.html) that is used to invoke the IIIF API via HTTPS.
 * A [Lambda Layer](https://docs.aws.amazon.com/lambda/latest/dg/configuration-layers.html) containing all the dependencies for the Lambda Function.
-* An optional [CloudFormation](https://aws.amazon.com/cloudformation/) template describing the resources needed to deploy the application.
 
 ## Prerequisites
 
@@ -111,7 +116,7 @@ npm test --coverage
 
 ## Custom Sharp Layer
 
-This lambda uses the Sharp layer from https://github.com/samvera/lambda-layer-sharp-jp2/releases in order to get a version of Sharp with jp2 support. You can build your own local version using that code and then deploy your own layer and set that layer in your SAM template.
+By default, the application uses a [custom sharp layer](https://github.com/samvera/lambda-layer-sharp-jp2/releases) built with JPEG2000 support. You can supply the ARN of another custom sharp/libvips Lambda layer, or, if you don't need JP2 support, use the value `INTERNAL` to use the precompiled sharp binaries from NPM.
 
 ## Advanced Usage
 
diff --git a/docs/lib/cfn-reader.js b/docs/lib/cfn-reader.js
index 3b060eb..a0beec8 100644
--- a/docs/lib/cfn-reader.js
+++ b/docs/lib/cfn-reader.js
@@ -13,6 +13,7 @@ function getParameters() {
 }
 
 async function getPropertyList(opts = {}) {
+  opts = { descPrefix: '', ...opts };
   const { compileMdx } = await import('nextra/compile');
 
   const result = getParameters();
diff --git a/docs/lib/cfn-tags.js b/docs/lib/cfn-tags.js
index b496e05..f6f343b 100644
--- a/docs/lib/cfn-tags.js
+++ b/docs/lib/cfn-tags.js
@@ -1,7 +1,8 @@
 const functionTags = {
   '!GetAtt': { type: 'string', quoted: false },
   '!Sub': { type: 'string', quoted: true },
-  '!Ref': { type: 'string', quoted: false }
+  '!Ref': { type: 'string', quoted: false },
+  '!Split': { type: 'array', quoted: false }
 };
 
 module.exports = Object.entries(functionTags).map(([tag, { quoted }]) => {
diff --git a/sam/template.yml b/sam/template.yml
index f891047..c4737f5 100644
--- a/sam/template.yml
+++ b/sam/template.yml
@@ -2,13 +2,13 @@ Transform: "AWS::Serverless-2016-10-31"
 Metadata:
   AWS::ServerlessRepo::Application:
     Name: serverless-iiif
-    Description: IIIF Image API 2.1 server backend Lambda function
+    Description: IIIF Image API 2.1 and 3.0 Service Lambda Function
     Author: Samvera
     SpdxLicenseId: Apache-2.0
     LicenseUrl: ../LICENSE.txt
     ReadmeUrl: ../README.md
     Labels: ["iiif", "image-processing"]
-    HomePageUrl: https://github.com/samvera/serverless-iiif
+    HomePageUrl: https://samvera.github.io/serverless-iiif
     SemanticVersion: 5.0.0
     SourceCodeUrl: https://github.com/samvera/serverless-iiif
   AWS::CloudFormation::Interface:
@@ -38,7 +38,7 @@ Metadata:
 Parameters:
   CorsAllowCredentials:
     Type: String
-    Description: |
+    Description: >
       Value of the CORS `Access-Control-Allow-Credentials` response header.
       Must be `true` to allow requests with `Authorization` and/or
       `Cookie` headers.
@@ -52,7 +52,7 @@ Parameters:
     Default: "*"
   CorsAllowOrigin:
     Type: String
-    Description: |
+    Description: >
       Value of the CORS `Access-Control-Allow-Origin` response header.
       Use the special value `REFLECT_ORIGIN` to copy the value from the
       `Origin` request header (required to emulate `*` for XHR requests
@@ -94,7 +94,7 @@ Parameters:
     Default: false
   PyramidLimit:
     Type: Number
-    Description: Smallest pyramid image dimension. Set to 0 to prevent server from auto-calculating pyramid page sizes.
+    Description: Smallest pyramid image dimension. Set to `0` to prevent server from auto-calculating pyramid page sizes.
     MinValue: 0
     Default: 256
   ResolverTemplate:
@@ -103,7 +103,7 @@ Parameters:
     Default: "%s.tif"
   SharpLayer:
     Type: String
-    Description: |
+    Description: >
       ARN of a custom AWS Lambda Layer containing the sharp and libvips dependencies. Use the special value `JP2` 
       to use the managed JPEG2000-compatible layer, or `INTERNAL` to use the built-in dependencies (without JPEG2000
       support).