diff --git a/docs/api/packages/xerror.md b/docs/api/packages/xerror.md
index 002765b..164a507 100644
--- a/docs/api/packages/xerror.md
+++ b/docs/api/packages/xerror.md
@@ -529,8 +529,8 @@ func main() {
         return errors.New("error in try block")
     }).Catch(func(ctx context.Context, err error) {
         calledCatch = true
-		// Error in try block at /path/xxx.go:{line_number} - Cause: error message
-		// fmt.Println(err.Error())
+        // Error in try block at /path/xxx.go:{line_number} - Cause: error message
+        // fmt.Println(err.Error())
     }).Finally(func(ctx context.Context) {
         calledFinally = true
     }).Do()
diff --git a/docs/en/api/packages/xerror.md b/docs/en/api/packages/xerror.md
index f4dc44f..bdf96db 100644
--- a/docs/en/api/packages/xerror.md
+++ b/docs/en/api/packages/xerror.md
@@ -528,7 +528,7 @@ func main() {
     }).Catch(func(ctx context.Context, err error) {
         calledCatch = true
         // Error in try block at /path/xxx.go:{line_number} - Cause: error message
-		// fmt.Println(err.Error())
+        // fmt.Println(err.Error())
     }).Finally(func(ctx context.Context) {
         calledFinally = true
     }).Do()