diff --git a/README.md b/README.md
index b7f44347e..5174208cc 100644
--- a/README.md
+++ b/README.md
@@ -9,3 +9,14 @@ and a larger image (700 px width) in each respective directory (assets/images/bo
 and process them in something like https://squoosh.app/ to reduce file size. If
 you only have one image, place it in the 'original' folder.
 3. Create a pull request with the file changes.
+
+**To test your changes locally:**
+
+1. You need "ruby" and "ruby-bundler" installed locally.  These instructions
+were tested with ruby 2.5 and ruby-bundler 1.17.3 on a Debian Stretch system.
+2. As needed, `git submodule update --init --recursive` to fetch the submodules
+3. One time, run `bundle install --path vendor/bundle`
+4. Run `bundle exec jekyll serve` to generate the site locally
+5. Visit the displayed "server address"
+6. After most local edits, the content will be updated.  You will need to
+reload (ctrl-r or F5) your browser