diff --git a/README.md b/README.md
index 9b131f3..1677996 100644
--- a/README.md
+++ b/README.md
@@ -16,17 +16,17 @@ the PlantUML source in the `example/` directory.
 
 **Install from pub:**
 
-`pub global activate dcdg`
+`dart pub global activate dcdg`
 
 **Install from clone:**
 
-`pub global activate -s path .`
+`dart pub global activate -s path .`
 
 ## Usage
 
 From inside a Dart package directory:
 
-`pub global run dcdg`
+`dart pub global run dcdg`
 
 This will dump a PlantUML file to stdout. You can save it to a file
 instead with the `-o` option.
@@ -60,3 +60,4 @@ Run the full test suite (including unit and functional tests) with
 If you change the user interface or add features you should run `tool/docs.sh`
 to regenerate documentation and other resources. This script requires
 [PlantUML](https://plantuml.com/).
+
diff --git a/example/dcdg.png b/example/dcdg.png
index e6df57e..f9b73b7 100644
Binary files a/example/dcdg.png and b/example/dcdg.png differ
diff --git a/example/dcdg.puml b/example/dcdg.puml
index cc8a304..592bf0e 100644
--- a/example/dcdg.puml
+++ b/example/dcdg.puml
@@ -136,11 +136,15 @@ class "dcdg::src::diagram_visitor.dart::DiagramVisitor" {
   +void visitMethodElement()
 }
 
+"analyzer::dart::element::visitor.dart::RecursiveElementVisitor" <|-- "dcdg::src::diagram_visitor.dart::DiagramVisitor"
+
 class "dcdg::src::class_element_collector.dart::ClassElementCollector" {
   +Iterable<ClassElement> classElements
   +void visitClassElement()
   +void visitExportElement()
 }
 
+"analyzer::dart::element::visitor.dart::RecursiveElementVisitor" <|-- "dcdg::src::class_element_collector.dart::ClassElementCollector"
+
 
 @enduml
\ No newline at end of file
diff --git a/lib/src/version.dart b/lib/src/version.dart
index e913c82..72443e1 100644
--- a/lib/src/version.dart
+++ b/lib/src/version.dart
@@ -1 +1 @@
-const version = '3.1.1';
+const version = '4.0.0';
diff --git a/pubspec.yaml b/pubspec.yaml
index 40c9a8b..4590431 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: dcdg
 description: A tool to automatically generate class diagrams (like UML) from a Dart package.
-version: 3.1.1
+version: 4.0.0
 homepage: https://github.com/glesica/dcdg.dart
 executables:
   dcdg: