diff --git a/modules/lang/plantuml/doctor.el b/modules/lang/plantuml/doctor.el
index 4e07331ea..bad0706fc 100644
--- a/modules/lang/plantuml/doctor.el
+++ b/modules/lang/plantuml/doctor.el
@@ -5,6 +5,9 @@
   ;; java
   (unless (executable-find "java")
     (warn! "Couldn't find java. PlantUML preview or syntax checking won't work"))
+  ;; graphviz
+  (unless (executable-find "dot")
+    (warn! "Couldn't find dot. PlantUML will only show outputs for sequence and activity diagrams"))
   ;; plantuml.jar
   (unless (file-exists-p plantuml-jar-path)
     (warn! "Couldn't find plantuml.jar. Install it with M-x plantuml-download-jar")))