diff --git a/README.md b/README.md
index ede4b3e..bcd7aaf 100644
--- a/README.md
+++ b/README.md
@@ -79,6 +79,7 @@ A number of **parsers** have been implemented. Some **parsers** can parse output
 | [_Infer_](http://fbinfer.com/)                                                        | `PMD`                | Facebook Infer. With `--pmd-xml`.
 | [_JCReport_](https://github.com/jCoderZ/fawkez/wiki/JcReport)                         | `JCREPORT`           | 
 | [_JSHint_](http://jshint.com/)                                                        | `JSHINT`             | 
+| [_JUnit_](https://junit.org/junit4/)                                                  | `JUNIT`              | 
 | [_KTLint_](https://github.com/shyiko/ktlint)                                          | `CHECKSTYLE`         | 
 | [_Klocwork_](http://www.klocwork.com/products-services/klocwork/static-code-analysis)  | `KLOCWORK`           | 
 | [_KotlinGradle_](https://github.com/JetBrains/kotlin)                                 | `KOTLINGRADLE`       | Output from Kotlin Gradle Plugin.
diff --git a/src/main/java/se/bjurr/violations/main/Runner.java b/src/main/java/se/bjurr/violations/main/Runner.java
index 5be6ea3..dfefccc 100644
--- a/src/main/java/se/bjurr/violations/main/Runner.java
+++ b/src/main/java/se/bjurr/violations/main/Runner.java
@@ -53,7 +53,7 @@ public void main(final String args[]) throws Exception {
             .collect(Collectors.joining(", "));
     final Argument<List<List<String>>> violationsArg =
         stringArgument("--violations", "-v")
-            .variableArity()
+            .arity(4)
             .repeated()
             .description(
                 "The violations to look for. <PARSER> <FOLDER> <REGEXP PATTERN> <NAME> where PARSER is one of: "