diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad63989..b5d6e0e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@
 - Feature: multiple primer trimming.
 - Feature: UMI trimming.
 
+## v4.0.3
+
+- Fix: `--order` or `-O` option should accept multiple arguments.
+
 ## v4.0.2
 
 - Fix: `--detect-adapter` for paired reads: refer to index 1 of empty vector when no adapter is found.
diff --git a/Project.toml b/Project.toml
index 4f41bc0..eff4b33 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "Atria"
 uuid = "226cbef3-b485-431c-85c2-d8bd8da14025"
 authors = ["Jiacheng Chuan <jiacheng_chuan@outlook.com>"]
-version = "4.0.2"
+version = "4.0.3"
 
 [deps]
 ArgParse = "c7e460c6-2fb9-53a9-8c5b-16f535851c63"
diff --git a/src/Trimmer/args.jl b/src/Trimmer/args.jl
index c931244..5f10953 100644
--- a/src/Trimmer/args.jl
+++ b/src/Trimmer/args.jl
@@ -82,6 +82,7 @@ function parsing_args(args::Vector; exit_after_help = true)
             help = "order of trimming and filtration processing methods. Unlisted process will not be done. See epilog for process names"
             metavar = "PROCESS"
             default = String["DefaultOrder"]
+            nargs = '+'
     end
 
     add_arg_group!(settings, "poly X tail trimming")