diff --git a/Makefile b/Makefile
index 690f8b0..a64179f 100644
--- a/Makefile
+++ b/Makefile
@@ -72,9 +72,14 @@ lan-server:
 open:
 	nohup xdg-open "http://localhost:$(PORT)" >/dev/null 2>/dev/null
 
+
+# Update Doxygen documentation.
+docs-once:
+	doxygen -q
+
 # Update Doxygen documentation on file change.
 docs:
-	$(MAKE) WATCHCMD="doxygen -q" watchdog |& sed "s:`realpath .`::"
+	$(MAKE) WATCHCMD="$(MAKE) docs-once" watchdog |& sed "s:`realpath .`::"
 
 # Update Doxygen documentation on change and show in browser.
 dev-docs: PORT = 8082