docs: add limitation of --include-resource-hook flag

Signed-off-by: TomeHirata <tomu.hirata@gmail.com>

cmd/argocd/commands/app.go

@@ -912,7 +912,7 @@ func NewApplicationDiffCommand(clientOpts *argocdclient.ClientOptions) *cobra.Co
 	command.Flags().BoolVar(&refresh, "refresh", false, "Refresh application data when retrieving")
 	command.Flags().BoolVar(&hardRefresh, "hard-refresh", false, "Refresh application data as well as target manifests cache")
 	command.Flags().BoolVar(&exitCode, "exit-code", true, "Return non-zero exit code when there is a diff")
-	command.Flags().BoolVar(&includeResourceHook, "include-resource-hook", false, "Display the diff of resource hooks")
+	command.Flags().BoolVar(&includeResourceHook, "include-resource-hook", false, "Display the diff of resource hooks. Used together with --local or --revision")
 	command.Flags().StringVar(&local, "local", "", "Compare live app to a local manifests")
 	command.Flags().StringVar(&revision, "revision", "", "Compare live app to a particular revision")
 	command.Flags().StringVar(&localRepoRoot, "local-repo-root", "/", "Path to the repository root. Used together with --local allows setting the repository root")

docs/user-guide/commands/argocd_app_diff.md

@@ -18,7 +18,7 @@ argocd app diff APPNAME [flags]
       --exit-code                Return non-zero exit code when there is a diff (default true)
       --hard-refresh             Refresh application data as well as target manifests cache
   -h, --help                     help for diff
-      --include-resource-hook    Display the diff of resource hooks
+      --include-resource-hook    Display the diff of resource hooks. Used together with --local or --revision
       --local string             Compare live app to a local manifests
       --local-repo-root string   Path to the repository root. Used together with --local allows setting the repository root (default "/")
       --refresh                  Refresh application data when retrieving