diff --git a/CHANGELOG.md b/CHANGELOG.md
index 92939b24..51ef1e9b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - New build for Rocky Linux 9
 - Add nightly release support. #969
 - Add container rename command. #583
+- Add container build flags and warn message after container sync. #509
 
 ### Fixed
 - Make Variables.mk consistent with spec file w.r.t. WWPROVISIONDIR, e.g.
diff --git a/internal/app/wwctl/container/syncuser/main.go b/internal/app/wwctl/container/syncuser/main.go
index 369c046a..67e2d296 100644
--- a/internal/app/wwctl/container/syncuser/main.go
+++ b/internal/app/wwctl/container/syncuser/main.go
@@ -5,6 +5,8 @@ import (
 	"os"
 
 	"github.com/spf13/cobra"
+	container_build "github.com/warewulf/warewulf/internal/pkg/api/container"
+	"github.com/warewulf/warewulf/internal/pkg/api/routes/wwapiv1"
 	"github.com/warewulf/warewulf/internal/pkg/container"
 	"github.com/warewulf/warewulf/internal/pkg/wwlog"
 )
@@ -20,5 +22,23 @@ func CobraRunE(cmd *cobra.Command, args []string) error {
 		os.Exit(1)
 	}
 
+	if write && !build {
+		// when write = true and build = false, we will print a warnning, this is the default case
+		wwlog.Warn("Syncuser is completed, please remember to rebuild container or add `--build` flag for automatic rebuild after syncuser")
+	} else if write && build {
+		// if write = true and build = true, then it'll trigger the container build after sync
+		cbp := &wwapiv1.ContainerBuildParameter{
+			ContainerNames: []string{containerName},
+			Force:          true,
+			All:            false,
+			Default:        false,
+		}
+		err := container_build.ContainerBuild(cbp)
+		if err != nil {
+			wwlog.Error("Error during container build: %s", err)
+			os.Exit(1)
+		}
+	}
+
 	return nil
 }
diff --git a/internal/app/wwctl/container/syncuser/root.go b/internal/app/wwctl/container/syncuser/root.go
index d14c100b..296ed34e 100644
--- a/internal/app/wwctl/container/syncuser/root.go
+++ b/internal/app/wwctl/container/syncuser/root.go
@@ -25,10 +25,12 @@ uid/gid collision is detected. File ownerships are also changed.`,
 		Args: cobra.MinimumNArgs(1),
 	}
 	write bool
+	build bool
 )
 
 func init() {
 	baseCmd.PersistentFlags().BoolVar(&write, "write", false, "Synchronize uis/gids and write files in container")
+	baseCmd.PersistentFlags().BoolVar(&build, "build", false, "Build container after syncuser is completed")
 }
 
 // GetRootCommand returns the root cobra.Command for the application.