diff --git a/README.md b/README.md
index 2e476be..7a581b9 100644
--- a/README.md
+++ b/README.md
@@ -15,16 +15,17 @@ command then uses an adapted `CompileOperation` to include the generated
 sources into the main source directories.
 
 ```java
-private final Antlr4Operation antlr4Operation_ = new Antlr4Operation();
+private final Antlr4Operation antlr4Operation = new Antlr4Operation();
+private final CompileOperation compileOperation = new CompileOperation();
 
 @BuildCommand(summary = "Generates the grammar Java sources")
 public void generateGrammar()
 throws Exception {
-    antlr4Operation_.executeOnce(o -> o
+    antlr4Operation.executeOnce(o -> o
         .sourceDirectories(List.of(new File(srcMainDirectory(), "antlr")))
         .outputDirectory(new File(buildDirectory(), "generated"))
         // these options are specific to ANTLR4, please refer to the extension
-        // documentation to learn more about these and other option
+        // documentation to learn more about these and others
         .visitor()
         .longMessages());
 }
@@ -35,10 +36,9 @@ throws Exception {
     // always generate the latest grammar before compiling the sources
     generateGrammar();
 
-    // compileOperation_ is part of the main project, include the generated
-    // grammar with the main sources
-    compileOperation_.executeOnce(o -> o
+    // include the generated grammar with the main sources
+    compileOperation.executeOnce(o -> o
         .fromProject(this)
-        .mainSourceDirectories(List.of(antlr4Operation_.outputDirectory())));
+        .mainSourceDirectories(List.of(antlr4Operation.outputDirectory())));
 }
 ```
\ No newline at end of file