diff --git a/CHANGELOG.md b/CHANGELOG.md
index b66f43ab..a419169f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 - Replace fireEvent with userEvent
 - Feedback button test PW
 - SFR-1797: Remove Playwright tests with clicks on header and footer links
+- Update README with C4 diagrams and epub-to-webpub info
 
 ## [0.17.4]
 
diff --git a/README.md b/README.md
index 4d3ce077..2f423053 100644
--- a/README.md
+++ b/README.md
@@ -70,10 +70,18 @@ Term combinations
   - Webpub reader: DRB serves an epub through the [webpub-viewer](https://github.com/NYPL-Simplified/webpub-viewer/tree/SFR-develop). DRB commonly does this for Gutenberg Project books.
   - Download: DRB offers a link to download the book online. This is often done for PDFs.
 
+### EPUB to Webpub
+
+The EPUB to Webpub Next.js app is deployed at `https://epub-to-webpub.vercel.app`. The **`/api/[containerXmlUrl]`** endpoint is used by the DRB backend to convert `container.xml` files of exploded EPUBs to webpub manifests.
+
 ### Test
 
 To run unit tests, run `npm run test` in the terminal.
 
+### C4 Architecture Diagrams
+
+Diagrams for DRB can found via our public [Structurizr link](https://structurizr.com/share/72104) and can be updated in the (c4-diagrams repo)[https://github.com/NYPL-Simplified/c4-diagrams].
+
 ### Deprecated
 
 As of September 2023, the [rspec-integration-tests.yml](https://github.com/NYPL/sfr-bookfinder-front-end/actions/workflows/rspec-integration-tests.yml) workflow is no longer in use and has been replaced by the [Playwright.yml](https://github.com/NYPL/sfr-bookfinder-front-end/blob/development/.github/workflows/Playwright.yml) workflow. Please contact the DRB team in Digital for more information.