diff --git a/src/bundle/README.txt b/src/bundle/README.txt
new file mode 100644
index 0000000..43e9e5c
--- /dev/null
+++ b/src/bundle/README.txt
@@ -0,0 +1,31 @@
+This zip file contains the data for a tour made with TourForge. In order for a
+mobile tour guide app to use the data, it has to be uploaded to a web server.
+
+Simply upload all the files in this zip to a server, such that they are all
+available for download. This includes the index.html and index.js files, which
+are there so that users of TourForge can visit the URL where the tour data is
+stored and have the tour data be automatically downloaded by TourForge.
+
+For example, the list of files in this archive look something like this:
+- tourforge.json
+- index.html
+- index.js
+- dbd57c2b1d5aa3d84bdc7eaa7cd57dd7c66bd6cccd851394b2c4cf96570239ff
+- ... more long strings of random numbers and letters ...
+
+The files with long strings of random numbers and letters are assets for the
+tour: mostly images and audio. The random numbers and letters of each file
+name correspond to the SHA-256 hash of the file.
+
+The web server needs to serve the data in this zip from some common base URL.
+Continuing with the previous example, your configuration could serve the files
+in a pattern like this:
+- https://your.site.example.org/some/path/to/the/files/tourforge.json
+- https://your.site.example.org/some/path/to/the/files/index.html
+- https://your.site.example.org/some/path/to/the/files/index.js
+- https://your.site.example.org/some/path/to/the/files/dbd57c2b1d5aa3d84bdc7eaa7cd57dd7c66bd6cccd851394b2c4cf96570239ff
+- ... make sure each asset is included ...
+
+It is important that the files are all served from the same base URL. This URL
+is what is used by the tour guide mobile app to know where to download the tour
+files.
\ No newline at end of file
diff --git a/src/export.ts b/src/export.ts
index bb6a809..cf6dafc 100644
--- a/src/export.ts
+++ b/src/export.ts
@@ -2,6 +2,7 @@ import JSZip from "jszip";
 
 import bundleIndexJsContent from "../gen/bundle/index.js?raw";
 
+import readmeTxtContent from "./bundle/README.txt?raw";
 import bundleIndexHtmlContent from "./bundle/index.html?raw";
 import { type ProjectModel } from "./data";
 import { type DB } from "./db";
@@ -50,6 +51,7 @@ const exportProjectBundleRaw = async (project: ProjectModel, loadAsset: (hash: s
   let zipBlob: Blob;
   try {
     const zip = new JSZip();
+    zip.file("README.txt", readmeTxtContent);
     zip.file("index.html", bundleIndexHtmlContent.replaceAll("%PROJECT_TITLE%", project.title).replaceAll("%INDEX_JS%", "index.js"));
     zip.file("index.js", bundleIndexJsContent);
     zip.file("tourforge.json", projectContentString);