diff --git a/src/main/org/apache/tools/ant/types/ModuleVersion.java b/src/main/org/apache/tools/ant/types/ModuleVersion.java
index 551b959de..18b057db5 100644
--- a/src/main/org/apache/tools/ant/types/ModuleVersion.java
+++ b/src/main/org/apache/tools/ant/types/ModuleVersion.java
@@ -51,6 +51,7 @@ public class ModuleVersion {
      * an ASCII hyphen ({@code -}) or plus ({@code +}), as those characters
      * are used as delimiters in a complete module version string.
      *
+     * @param number version number
      * @throws NullPointerException if argument is {@code null}
      * @throws IllegalArgumentException if argument contains {@code '-'}
      *                                  or {@code '+'}