diff --git a/.github/images/pr_image.png b/.github/images/pr_image.png
deleted file mode 100644
index 0408cab..0000000
Binary files a/.github/images/pr_image.png and /dev/null differ
diff --git a/.github/images/pr_image_dark.png b/.github/images/pr_image_dark.png
new file mode 100644
index 0000000..79019ae
Binary files /dev/null and b/.github/images/pr_image_dark.png differ
diff --git a/.github/images/pr_image_light.png b/.github/images/pr_image_light.png
new file mode 100644
index 0000000..86be307
Binary files /dev/null and b/.github/images/pr_image_light.png differ
diff --git a/.github/workflows/close-master-prs.yml b/.github/workflows/close-master-prs.yml
index c610258..d0edfda 100644
--- a/.github/workflows/close-master-prs.yml
+++ b/.github/workflows/close-master-prs.yml
@@ -28,7 +28,12 @@ jobs:
           GH_REPO: ${{ github.repository }}
           PR_NUM: ${{ github.event.pull_request.number }}
           COMMENT: >
-              This PR is automatically closed because application submission
-              PRs must be made against the new-pr branch. If this is done
-              in error, please comment.
-              ![PR Image](https://raw.githubusercontent.com/flathub/flathub/refs/heads/master/.github/images/pr_image.png)
+              This PR is automatically closed because application
+              submission pull requests must be made against the new-pr
+              branch. Please choose the base repository as
+              "flathub/flathub" and the base as "new-pr" in the
+              "Comparing changes" screen when making the pull request.
+              The image below shows this. If this was closed in
+              error, please comment.
+              ![Image showing new-pr target branch in light mode](https://raw.githubusercontent.com/flathub/flathub/refs/heads/master/.github/images/pr_image_light.png#gh-light-mode-only)
+              ![Image showing new-pr target branch in dark mode](https://raw.githubusercontent.com/flathub/flathub/refs/heads/master/.github/images/pr_image_dark.png#gh-dark-mode-only)