From cc37bb013b4c240b94508a4a5e946c67a3b6fd89 Mon Sep 17 00:00:00 2001
From: Eric Bottard <eric.bottard+github@gmail.com>
Date: Thu, 10 Aug 2017 13:49:28 +0200
Subject: [PATCH] Document constants in @ShellOption

---
 .../org/springframework/shell/standard/ShellOption.java    | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/spring-shell-standard/src/main/java/org/springframework/shell/standard/ShellOption.java b/spring-shell-standard/src/main/java/org/springframework/shell/standard/ShellOption.java
index 0ab432e7..5a862199 100644
--- a/spring-shell-standard/src/main/java/org/springframework/shell/standard/ShellOption.java
+++ b/spring-shell-standard/src/main/java/org/springframework/shell/standard/ShellOption.java
@@ -33,8 +33,15 @@ import java.lang.annotation.Target;
 @Target(ElementType.PARAMETER)
 public @interface ShellOption {
 
+	/**
+	 * Used to indicate that the default value is the value {@literal null}, which is different from the fact that
+	 * there is no default value.
+	 */
 	String NULL = "__NULL__";
 
+	/**
+	 * Used to indicate that there is no default value (<em>i.e.</em> parameter is mandatory).
+	 */
 	String NONE = "__NONE__";
 
 	/**