diff --git a/README.md b/README.md
index 66e32bc..e849344 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,10 @@ Browseroute is a macOS menu-bar app. It registers as the default web browser,
 then opens every link in the matching browser: host suffix, host glob, or
 host+path glob. Unmatched links go to the catch-all you mark as Default.
 
+<p align="center">
+  <img width="340" alt="Browseroute popover" src="docs/popover.png">
+</p>
+
 ## Install
 
 macOS 14+. Builds are signed with a Developer ID certificate and notarized by
@@ -35,21 +39,21 @@ make install
 open /Applications/Browseroute.app
 ```
 
-Click the menu-bar icon (branch arrow). Add your browsers, set one as the
-default catch-all, then **Settings → Set as Default Browser…** and accept the
+Click the menu-bar icon (the branch arrow). Add your browsers, set one as the
+Default catch-all, then Settings → Set as Default Browser… and accept the
 system dialog.
 
 `make install` copies the app to `/Applications/Browseroute.app`. Default-browser
 registration only works from that stable path, not from a random `build/` copy.
 
-Turn on **Settings → Launch at Login** so routing stays instant — otherwise macOS
-cold-starts the app on every click. The **Routing** switch in the popover header
+Turn on Settings → Launch at Login so routing stays instant. Otherwise macOS
+cold-starts the app on every click. The Routing switch in the popover header
 pauses matching: every link then opens in the Default catch-all.
 
 ## Rules
 
-Browsers and patterns are edited in the popover. Evaluation is top-to-bottom,
-first match wins. Matching is case-insensitive.
+Browsers and patterns are edited in the popover. Rules are tried top to bottom;
+the first match wins. Matching is case-insensitive.
 
 | Pattern | Matches |
 |---|---|
@@ -57,8 +61,13 @@ first match wins. Matching is case-insensitive.
 | `*.corp.com` | host glob (`a.corp.com`). Not the apex `corp.com`. |
 | `github.com/work-org` or `github.com/work-org/*` | host + path. A pattern with `/` gets an implicit trailing `*` if it does not already end in `*`. |
 
-No match → the Default catch-all. If none is set, the first browser in the list.
-If the list is empty, Safari.
+If nothing matches, it uses the Default catch-all. If none is set, the first
+browser in the list. If the list is empty, Safari.
+
+Outlook SafeLinks are unwrapped first, so matching uses the inner host.
+
+If the chosen browser is missing, a notification says so. The link then opens
+in the Default catch-all when that one is installed; otherwise it is not opened.
 
 ## Develop
 
@@ -68,7 +77,7 @@ make check    # lint + build + test
 make install  # package and copy to /Applications
 ```
 
-The app is an `LSUIElement` agent — no Dock icon.
+The app is an `LSUIElement` agent, so it has no Dock icon.
 
 ## License
 
diff --git a/docs/popover.png b/docs/popover.png
new file mode 100644
index 0000000..3f68ca2
Binary files /dev/null and b/docs/popover.png differ