diff --git a/browse-slack/README.md b/browse-slack/README.md
index bcbfc7ec..2d585c31 100644
--- a/browse-slack/README.md
+++ b/browse-slack/README.md
@@ -3,14 +3,17 @@ To try it out (on Linux; it's unusably slow on other platforms):
 1. Import a Slack archive into the data disk by following the instructions at
    the top of `browse-slack/convert_slack.py`.
 
-2. Build the code disk.
+   There's also a test disk image you can try out by running:
+   ```
+   tools/image-data 10 < browse-slack/test_data
+   ```
 
-```
-./translate browse-slack/*.mu
-```
+2. Build the code disk.
+   ```
+   ./translate browse-slack/*.mu
+   ```
 
 3. Run the code and data disks:
-
-```
-qemu-system-i386 -accel kvm -m 2G -hda code.img -hdb path/to/data.img
-```
+   ```
+   qemu-system-i386 -accel kvm -m 2G -hda code.img -hdb path/to/data.img
+   ```