diff --git a/client/clienter.go b/client/clienter.go
index 4393071..ddbc491 100644
--- a/client/clienter.go
+++ b/client/clienter.go
@@ -11,7 +11,7 @@ type Clienter interface {
 	Branches(ctx context.Context, repoDirs []string, args ...string) error
 	CheckoutRepos(ctx context.Context, repoDirs []string, args ...string) error
 	CloneRepos(ctx context.Context, dir string) ([]*Repository, error)
-	DiffRepos(ctx context.Context, repoDirs []string, ignoreEmtpy bool, args ...string) error
+	DiffRepos(ctx context.Context, repoDirs []string, cfg *DiffConfig) error
 	GetDirs(ctx context.Context, dir string) ([]string, error)
 	GetLogins(ctx context.Context) ([]string, error)
 	GetRepos(ctx context.Context, name string) ([]*github.Repository, error)
diff --git a/client/repos_diff.go b/client/repos_diff.go
index e1da72a..935d5a1 100644
--- a/client/repos_diff.go
+++ b/client/repos_diff.go
@@ -1,6 +1,7 @@
 package client
 
 import (
+	"bufio"
 	"bytes"
 	"context"
 	"fmt"
@@ -8,8 +9,14 @@ import (
 	"strings"
 )
 
-func (c *Client) DiffRepos(ctx context.Context, dirs []string, ignoreEmtpy bool, args ...string) error {
-	args = append([]string{"diff"}, args...)
+type DiffConfig struct {
+	IgnoreEmpty      bool
+	IgnoreFilePrefix []string
+	Args             []string
+}
+
+func (c *Client) DiffRepos(ctx context.Context, dirs []string, cfg *DiffConfig) error {
+	args := append([]string{"diff"}, cfg.Args...)
 
 	c.scrb.BeginDescribe("Command")
 	defer c.scrb.EndDescribe()
@@ -30,7 +37,10 @@ func (c *Client) DiffRepos(ctx context.Context, dirs []string, ignoreEmtpy bool,
 
 		err := cmd.Run()
 
-		if ignoreEmtpy && out.Len() == 0 && err == nil {
+		// filter first to have empty check accurate
+		out = filterLines(out, cfg.IgnoreFilePrefix)
+
+		if cfg.IgnoreEmpty && out.Len() == 0 && err == nil {
 			continue
 		}
 
@@ -47,3 +57,30 @@ func (c *Client) DiffRepos(ctx context.Context, dirs []string, ignoreEmtpy bool,
 
 	return nil
 }
+
+func filterLines(buf *bytes.Buffer, prefixes []string) *bytes.Buffer {
+	if len(prefixes) == 0 {
+		return buf
+	}
+
+	scanner := bufio.NewScanner(buf)
+	out := &bytes.Buffer{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		ignore := false
+		for _, prefix := range prefixes {
+			if strings.HasPrefix(line, prefix) {
+				ignore = true
+				break
+			}
+		}
+
+		if !ignore {
+			out.WriteString(line + "\n")
+		}
+	}
+
+	return out
+}
diff --git a/client/testclient/client.go b/client/testclient/client.go
index dc8d9a8..6757a47 100644
--- a/client/testclient/client.go
+++ b/client/testclient/client.go
@@ -99,7 +99,7 @@ func (c *TestClient) TagRepos(ctx context.Context, repoDirs []string, args ...st
 	return nil
 }
 
-func (c *TestClient) DiffRepos(ctx context.Context, repoDirs []string, ignoreEmtpy bool, args ...string) error {
+func (c *TestClient) DiffRepos(ctx context.Context, repoDirs []string, cfg *client.DiffConfig) error {
 	c.CommandsCalled = append(c.CommandsCalled, "DiffRepos")
 
 	return nil
diff --git a/cmd/diff.go b/cmd/diff.go
index 453b44d..85384b5 100644
--- a/cmd/diff.go
+++ b/cmd/diff.go
@@ -4,13 +4,15 @@ import (
 	"context"
 	"fmt"
 
+	"github.com/gomicro/align/client"
 	"github.com/spf13/cobra"
 )
 
 var (
-	short       bool
-	nameOnly    bool
-	ignoreEmtpy bool
+	short            bool
+	nameOnly         bool
+	ignoreEmtpy      bool
+	ignoreFilePrefix []string
 )
 
 func init() {
@@ -19,11 +21,13 @@ func init() {
 	diffCmd.Flags().StringVar(&dir, "dir", ".", "directory to diff repos from")
 
 	diffCmd.Flags().BoolVar(&ignoreEmtpy, "ignore-empty", false, "ignore empty diffs")
+	diffCmd.Flags().StringArrayVar(&ignoreFilePrefix, "ignore-file-prefix", []string{}, "ignore files in diffs with the given prefix")
 
 	diffCmd.Flags().BoolVar(&short, "shortstat", false, "show only the number of changed files, insertions, and deletions")
 	diffCmd.Flags().BoolVar(&nameOnly, "name-only", false, "show only names of changed files")
 
 	diffCmd.MarkFlagsMutuallyExclusive("shortstat", "name-only")
+	diffCmd.MarkFlagsMutuallyExclusive("shortstat", "ignore-file-prefix")
 }
 
 var diffCmd = &cobra.Command{
@@ -52,7 +56,13 @@ func diffFunc(cmd *cobra.Command, args []string) error {
 		args = append(args, "--name-only")
 	}
 
-	err = clt.DiffRepos(ctx, repoDirs, ignoreEmtpy, args...)
+	cfg := &client.DiffConfig{
+		IgnoreEmpty:      ignoreEmtpy,
+		IgnoreFilePrefix: ignoreFilePrefix,
+		Args:             args,
+	}
+
+	err = clt.DiffRepos(ctx, repoDirs, cfg)
 	if err != nil {
 		cmd.SilenceUsage = true
 		return fmt.Errorf("diff repos: %w", err)