diff --git a/api/maven-api-cli/src/main/java/org/apache/maven/api/cli/ParserRequest.java b/api/maven-api-cli/src/main/java/org/apache/maven/api/cli/ParserRequest.java
index 014576b492..a218f23eb9 100644
--- a/api/maven-api-cli/src/main/java/org/apache/maven/api/cli/ParserRequest.java
+++ b/api/maven-api-cli/src/main/java/org/apache/maven/api/cli/ParserRequest.java
@@ -60,6 +60,7 @@ public interface ParserRequest {
      *
      * @return the command (human) name
      */
+    @Nonnull
     String commandName();
 
     /**