diff --git a/README.md b/README.md
index 427324b..fe96be3 100644
--- a/README.md
+++ b/README.md
@@ -122,6 +122,8 @@ A simple cli-app can be:
 ```go
 package main
 
+// Simplest tiny app
+
 import (
     "context"
     "io"
@@ -137,7 +139,7 @@ import (
 )
 
 func main() {
-    ctx := context.Background()
+    ctx := context.Background() // with cancel can be passed thru in your actions
     app := prepareApp(
         cmdr.WithStore(store.New()), // use an option store explicitly, or a dummy store by default
 
@@ -153,10 +155,13 @@ func main() {
 
         // true for debug in developing time, it'll disable onAction on each Cmd.
         // for productive mode, comment this line.
-        cmdr.WithForceDefaultAction(true),
+        // The envvars FORCE_DEFAULT_ACTION & FORCE_RUN can override this.
+        // cmdr.WithForceDefaultAction(true),
+
+        // cmdr.WithAutoEnvBindings(true),
     )
     if err := app.Run(ctx); err != nil {
-        logz.ErrorContext(ctx, "Application Error:", "err", err)
+        logz.ErrorContext(ctx, "Application Error:", "err", err) // stacktrace if in debug mode/build
         os.Exit(app.SuggestRetCode())
     }
 }
@@ -164,7 +169,7 @@ func main() {
 func prepareApp(opts ...cli.Opt) (app cli.App) {
     app = cmdr.New(opts...).
         Info("tiny-app", "0.3.1").
-        Author("hedzr")
+        Author("The Example Authors") // .Description(``).Header(``).Footer(``)
 
     // another way to disable `cmdr.WithForceDefaultAction(true)` is using
     // env-var FORCE_RUN=1 (builtin already).
@@ -182,7 +187,7 @@ func prepareApp(opts ...cli.Opt) (app cli.App) {
 
     app.Cmd("jump").
         Description("jump command").
-        Examples(`jump example`).
+        Examples(`jump example`). // {{.AppName}}, {{.AppVersion}}, {{.DadCommands}}, {{.Commands}}, ...
         Deprecated(`v1.1.0`).
         // Group(cli.UnsortedGroup).
         Hidden(false).
@@ -193,11 +198,20 @@ func prepareApp(opts ...cli.Opt) (app cli.App) {
                 Examples(``).
                 Deprecated(`v0.1.1`).
                 OnAction(func(ctx context.Context, cmd cli.Cmd, args []string) (err error) {
+                    // cmd.Set() == cmdr.Store(), cmd.Store() == cmdr.Store()
                     cmd.Set().Set("app.demo.working", dir.GetCurrentDir())
                     println()
-                    println(dir.GetCurrentDir())
-                    println()
-                    println(app.Store().Dump())
+                    println(cmd.Set().WithPrefix("app.demo").MustString("working"))
+
+                    cs := cmdr.Store().WithPrefix("jump.to")
+                    if cs.MustBool("full") {
+                        println()
+                        println(cmd.Set().Dump())
+                    }
+                    cs2 := cmd.Store()
+                    if cs2.MustBool("full") != cs.MustBool("full") {
+                        logz.Panic("a bug found")
+                    }
                     app.SetSuggestRetCode(1) // ret code must be in 0-255
                     return                   // handling command action here
                 }).
@@ -223,7 +237,7 @@ func prepareApp(opts ...cli.Opt) (app cli.App) {
         Description("a wrong command to return error for testing").
         // cmdline `FORCE_RUN=1 go run ./tiny wrong -d 8s` to verify this command to see the returned application error.
         OnAction(func(ctx context.Context, cmd cli.Cmd, args []string) (err error) {
-            dur := cmd.Store().MustDuration("wrong.duration")
+            dur := cmd.Store().MustDuration("duration")
             println("the duration is:", dur.String())
 
             ec := errors.New()
diff --git a/tiny/main.go b/tiny/main.go
index 75ff3a9..1c265b4 100644
--- a/tiny/main.go
+++ b/tiny/main.go
@@ -40,6 +40,7 @@ func main() {
 
 		// true for debug in developing time, it'll disable onAction on each Cmd.
 		// for productive mode, comment this line.
+		// The envvars FORCE_DEFAULT_ACTION & FORCE_RUN can override this.
 		cmdr.WithForceDefaultAction(true),
 
 		cmdr.WithSortInHelpScreen(true),       // default it's false
@@ -54,7 +55,7 @@ func main() {
 	// )
 
 	if err := app.Run(ctx); err != nil {
-		logz.ErrorContext(ctx, "Application Error:", "err", err)
+		logz.ErrorContext(ctx, "Application Error:", "err", err) // stacktrace if in debug mode/build
 		os.Exit(app.SuggestRetCode())
 	}
 }
@@ -62,7 +63,7 @@ func main() {
 func prepareApp(opts ...cli.Opt) (app cli.App) {
 	app = cmdr.New(opts...).
 		Info("tiny-app", "0.3.1").
-		Author("hedzr")
+		Author("The Example Authors") // .Description(``).Header(``).Footer(``)
 
 	// another way to disable `cmdr.WithForceDefaultAction(true)` is using
 	// env-var FORCE_RUN=1 (builtin already).
@@ -78,7 +79,7 @@ func prepareApp(opts ...cli.Opt) (app cli.App) {
 
 	app.Cmd("jump").
 		Description("jump command").
-		Examples(`jump example`).
+		Examples(`jump example`). // {{.AppName}}, {{.AppVersion}}, {{.DadCommands}}, {{.Commands}}, ...
 		Deprecated(`v1.1.0`).
 		// Group(cli.UnsortedGroup).
 		Hidden(false).
diff --git a/tiny/tiny/main.go b/tiny/tiny/main.go
index ef9920d..163c22f 100644
--- a/tiny/tiny/main.go
+++ b/tiny/tiny/main.go
@@ -17,7 +17,7 @@ import (
 )
 
 func main() {
-	ctx := context.Background()
+	ctx := context.Background() // with cancel can be passed thru in your actions
 	app := prepareApp(
 		cmdr.WithStore(store.New()), // use an option store explicitly, or a dummy store by default
 
@@ -33,10 +33,13 @@ func main() {
 
 		// true for debug in developing time, it'll disable onAction on each Cmd.
 		// for productive mode, comment this line.
-		cmdr.WithForceDefaultAction(true),
+		// The envvars FORCE_DEFAULT_ACTION & FORCE_RUN can override this.
+		// cmdr.WithForceDefaultAction(true),
+
+		// cmdr.WithAutoEnvBindings(true),
 	)
 	if err := app.Run(ctx); err != nil {
-		logz.ErrorContext(ctx, "Application Error:", "err", err)
+		logz.ErrorContext(ctx, "Application Error:", "err", err) // stacktrace if in debug mode/build
 		os.Exit(app.SuggestRetCode())
 	}
 }
@@ -44,7 +47,7 @@ func main() {
 func prepareApp(opts ...cli.Opt) (app cli.App) {
 	app = cmdr.New(opts...).
 		Info("tiny-app", "0.3.1").
-		Author("hedzr")
+		Author("The Example Authors") // .Description(``).Header(``).Footer(``)
 
 	// another way to disable `cmdr.WithForceDefaultAction(true)` is using
 	// env-var FORCE_RUN=1 (builtin already).
@@ -62,7 +65,7 @@ func prepareApp(opts ...cli.Opt) (app cli.App) {
 
 	app.Cmd("jump").
 		Description("jump command").
-		Examples(`jump example`).
+		Examples(`jump example`). // {{.AppName}}, {{.AppVersion}}, {{.DadCommands}}, {{.Commands}}, ...
 		Deprecated(`v1.1.0`).
 		// Group(cli.UnsortedGroup).
 		Hidden(false).
@@ -73,11 +76,20 @@ func prepareApp(opts ...cli.Opt) (app cli.App) {
 				Examples(``).
 				Deprecated(`v0.1.1`).
 				OnAction(func(ctx context.Context, cmd cli.Cmd, args []string) (err error) {
+					// cmd.Set() == cmdr.Store(), cmd.Store() == cmdr.Store()
 					cmd.Set().Set("app.demo.working", dir.GetCurrentDir())
 					println()
-					println(dir.GetCurrentDir())
-					println()
-					println(app.Store().Dump())
+					println(cmd.Set().WithPrefix("app.demo").MustString("working"))
+
+					cs := cmdr.Store().WithPrefix("jump.to")
+					if cs.MustBool("full") {
+						println()
+						println(cmd.Set().Dump())
+					}
+					cs2 := cmd.Store()
+					if cs2.MustBool("full") != cs.MustBool("full") {
+						logz.Panic("a bug found")
+					}
 					app.SetSuggestRetCode(1) // ret code must be in 0-255
 					return                   // handling command action here
 				}).