diff --git a/Cargo.toml b/Cargo.toml
index a4382f8..eea4b9a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "serde_trim"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["baoyachi <liaoymxsdl@gmail.com>"]
 edition = "2021"
 description = "serde deserialize_with String trim"
diff --git a/README.md b/README.md
index d881724..10471f3 100644
--- a/README.md
+++ b/README.md
@@ -29,5 +29,16 @@ fn main() {
     let json = r#"{"name":" "}"#;
     let foo = serde_json::from_str::<OptionFoo>(json).unwrap();
     assert_eq!(foo.name, None);
+
+    #[derive(Deserialize)]
+    struct OptionBar {
+        #[serde(default, deserialize_with = "option_string_trim")]
+        name: Option<String>,
+        addr: String,
+    }
+    let json = r#"{"addr":"ABC"}"#;
+    let foo = serde_json::from_str::<OptionBar>(json).unwrap();
+    assert_eq!(foo.name, None);
+    assert_eq!(foo.addr, "ABC");
 }
 ```
\ No newline at end of file
diff --git a/lib.rs b/lib.rs
index 9f1029d..003ad71 100644
--- a/lib.rs
+++ b/lib.rs
@@ -45,4 +45,15 @@ fn test_option_string_trim() {
     let json = r#"{"name":" "}"#;
     let foo = serde_json::from_str::<OptionFoo>(json).unwrap();
     assert_eq!(foo.name, None);
+
+    #[derive(Deserialize)]
+    struct OptionBar {
+        #[serde(default, deserialize_with = "option_string_trim")]
+        name: Option<String>,
+        addr: String,
+    }
+    let json = r#"{"addr":"ABC"}"#;
+    let foo = serde_json::from_str::<OptionBar>(json).unwrap();
+    assert_eq!(foo.name, None);
+    assert_eq!(foo.addr, "ABC");
 }