readme: List integrations

README.org

@@ -30,6 +30,15 @@ commands, then you should bind them in ~hl-todo-mode-map~, e.g.:
 
 See [[https://github.com/tarsius/hl-todo/wiki][FAQ and Common Issues]] if something isn't working as expected.
 
+*** Integrations
+
+- Command ~hl-todo-occur~ uses ~occur~ to list keywords.
+- Command ~hl-todo-rgrep~ uses ~rgrep~ to list keywords.
+- Function ~hl-todo-flymake~ can be used as a
+  ~flymake-diagnostic-functions~.
+- Package [[https://github.com/alvarogonzalezsotillo/flycheck-hl-todo][~flycheck-hl-todo~]] adds keywords to ~flycheck~.
+- Package [[https://github.com/alphapapa/magit-todos][~hl-todo~]] displays keybords in Magit's status buffer.
+
 #+html: <br><br>
 #+html: <a href="https://github.com/tarsius/hl-todo/actions/workflows/compile.yml"><img alt="Compile" src="https://github.com/tarsius/hl-todo/actions/workflows/compile.yml/badge.svg"/></a>
 #+html: <a href="https://stable.melpa.org/#/hl-todo"><img alt="MELPA Stable" src="https://stable.melpa.org/packages/hl-todo-badge.svg"/></a>