diff --git a/strum1/Cargo.lock b/strum1/Cargo.lock
index fe940e3..e0e451c 100644
--- a/strum1/Cargo.lock
+++ b/strum1/Cargo.lock
@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "anyhow"
+version = "1.0.68"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2cb2f989d18dd141ab8ae82f64d1a8cdd37e0840f73a406896cf5e99502fab61"
+
 [[package]]
 name = "heck"
 version = "0.4.0"
@@ -45,6 +51,7 @@ dependencies = [
 name = "strum1"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "strum",
 ]
 
diff --git a/strum1/Cargo.toml b/strum1/Cargo.toml
index 2f0fade..f620621 100644
--- a/strum1/Cargo.toml
+++ b/strum1/Cargo.toml
@@ -7,3 +7,6 @@ edition = "2021"
 
 [dependencies]
 strum = { version = "0.24.1", features = ["derive"] }
+
+[dev-dependencies]
+anyhow = "1.0.68"
diff --git a/strum1/README.md b/strum1/README.md
new file mode 100644
index 0000000..8dd0884
--- /dev/null
+++ b/strum1/README.md
@@ -0,0 +1,5 @@
+# strum
+
+[crates:strum] の例を書く。
+
+[crates:strum]: https://crates.io/crates/strum
diff --git a/strum1/src/as_ref_str.rs b/strum1/src/as_ref_str.rs
new file mode 100644
index 0000000..76c4009
--- /dev/null
+++ b/strum1/src/as_ref_str.rs
@@ -0,0 +1,27 @@
+// <https://docs.rs/strum_macros/0.24.1/strum_macros/derive.AsRefStr.html>
+// impl X for AsRef<str> を追加できる
+
+#[allow(dead_code)]
+#[derive(strum::AsRefStr)]
+enum E1 {
+    A1,
+    #[strum(serialize = "b")]
+    B1,
+    C1(usize),
+    D1 {
+        s: String,
+    },
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn e1_test() {
+        assert_eq!(E1::A1.as_ref(), "A1");
+        assert_eq!(E1::B1.as_ref(), "b");
+        assert_eq!(E1::C1(10).as_ref(), "C1");
+        assert_eq!(E1::D1 { s: "s1".to_owned() }.as_ref(), "D1");
+    }
+}
diff --git a/strum1/src/enum_count.rs b/strum1/src/enum_count.rs
new file mode 100644
index 0000000..2786056
--- /dev/null
+++ b/strum1/src/enum_count.rs
@@ -0,0 +1,23 @@
+// <https://docs.rs/strum_macros/0.24.1/strum_macros/derive.EnumCount.html>
+// EnumCount は COUNT を追加できる
+
+#[allow(dead_code)]
+#[derive(strum::EnumCount)]
+enum E1 {
+    A1,
+    B1,
+    C1,
+}
+
+#[cfg(test)]
+mod tests {
+    // これがないと E1::COUNT とできない
+    use strum::EnumCount;
+
+    use super::*;
+
+    #[test]
+    fn e1_test() {
+        assert_eq!(E1::COUNT, 3);
+    }
+}
diff --git a/strum1/src/main.rs b/strum1/src/main.rs
index 3634933..9df9432 100644
--- a/strum1/src/main.rs
+++ b/strum1/src/main.rs
@@ -1,24 +1,39 @@
-// <https://docs.rs/strum_macros/0.24.1/strum_macros/derive.EnumCount.html>
-// EnumCount は COUNT を追加できる
+mod as_ref_str;
+mod enum_count;
 
 #[allow(dead_code)]
-#[derive(strum::EnumCount)]
+#[derive(Debug, Eq, PartialEq, strum::EnumString)]
 enum E1 {
     A1,
+    #[strum(serialize = "b")]
     B1,
-    C1,
+    C1(usize),
+    D1 {
+        // TODO: Default が取れない場合
+        s: String,
+    },
 }
 
 #[cfg(test)]
 mod tests {
-    // これがないと E1::COUNT とできない
-    use strum::EnumCount;
+    use std::str::FromStr;
 
     use super::*;
 
     #[test]
-    fn e1_test() {
-        assert_eq!(E1::COUNT, 3);
+    fn e1_test() -> anyhow::Result<()> {
+        assert_eq!(E1::A1, E1::from_str("A1")?);
+        assert_eq!(E1::A1, E1::try_from("A1")?);
+        assert!(E1::from_str("B1").is_err());
+        assert_eq!(E1::B1, E1::try_from("b")?);
+        assert_eq!(E1::C1(0), E1::try_from("C1")?);
+        assert_eq!(
+            E1::D1 {
+                s: String::default()
+            },
+            E1::try_from("D1")?
+        );
+        Ok(())
     }
 }