diff --git a/core/src/raw/ops.rs b/core/src/raw/ops.rs
index a51b0b144e02..5875160b068f 100644
--- a/core/src/raw/ops.rs
+++ b/core/src/raw/ops.rs
@@ -601,7 +601,7 @@ pub struct OpWrite {
     cache_control: Option<String>,
     executor: Option<Executor>,
     if_none_match: Option<String>,
-    if_not_exist: Option<bool>,
+    if_not_exists: bool,
     user_metadata: Option<HashMap<String, String>>,
 }
 
@@ -699,14 +699,14 @@ impl OpWrite {
     }
 
     /// Set the If-Not-Exist of the option
-    pub fn with_if_not_exist(mut self, b: bool) -> Self {
-        self.if_not_exist = Some(b);
+    pub fn with_if_not_exists(mut self, b: bool) -> Self {
+        self.if_not_exists = b;
         self
     }
 
     /// Get If-Not-Exist from option
-    pub fn if_not_exist(&self) -> Option<bool> {
-        self.if_not_exist
+    pub fn if_not_exists(&self) -> bool {
+        self.if_not_exists
     }
 
     /// Merge given executor into option.
diff --git a/core/src/services/s3/core.rs b/core/src/services/s3/core.rs
index 99cf3090e40f..abc97c4453d8 100644
--- a/core/src/services/s3/core.rs
+++ b/core/src/services/s3/core.rs
@@ -480,10 +480,8 @@ impl S3Core {
             req = req.header(IF_NONE_MATCH, if_none_match);
         }
 
-        if let Some(if_not_exist) = args.if_not_exist() {
-            if if_not_exist {
-                req = req.header(IF_NONE_MATCH, "*");
-            }
+        if args.if_not_exists() {
+            req = req.header(IF_NONE_MATCH, "*");
         }
 
         // Set body
diff --git a/core/src/types/operator/operator.rs b/core/src/types/operator/operator.rs
index 6a76ccdf77f1..11cc67861cbf 100644
--- a/core/src/types/operator/operator.rs
+++ b/core/src/types/operator/operator.rs
@@ -1254,20 +1254,22 @@ impl Operator {
     /// # }
     /// ```
     ///
-    /// ## `if_not_exist`
+    /// ## `if_not_exists`
     ///
-    /// Set `if_not_exist` for this `write` request. This can be treated as a simplified version
-    /// of [`OpWrite::if_none_match`].
+    /// This feature allows to safely write a file only if it does not exist. It is designed
+    /// to be concurrency-safe, and can be used to a file lock. For storage services that
+    /// support the `if_not_exist` feature, only one write operation will succeed, while all
+    /// other attempts will fail.
     ///
-    /// This feature is used to write a file only when it doesn't exist. If the file already
-    /// exists, an error with kind [`ErrorKind::ConditionNotMatch`] will be returned.
+    /// If the file already exists, an error with kind [`ErrorKind::ConditionNotMatch`] will
+    /// be returned.
     ///
     /// ```no_run
     /// # use opendal::{ErrorKind, Result};
     /// use opendal::Operator;
     /// # async fn test(op: Operator, etag: &str) -> Result<()> {
     /// let bs = b"hello, world!".to_vec();
-    /// let res = op.write_with("path/to/file", bs).if_not_exist(true).await;
+    /// let res = op.write_with("path/to/file", bs).if_not_exists(true).await;
     /// assert!(res.is_err());
     /// assert_eq!(res.unwrap_err().kind(), ErrorKind::ConditionNotMatch);
     /// # Ok(())}
diff --git a/core/src/types/operator/operator_futures.rs b/core/src/types/operator/operator_futures.rs
index f1652bf191fb..17f1cb77c749 100644
--- a/core/src/types/operator/operator_futures.rs
+++ b/core/src/types/operator/operator_futures.rs
@@ -330,8 +330,8 @@ impl<F: Future<Output = Result<()>>> FutureWrite<F> {
     }
 
     /// Set the If-Not-Exist for this operation.
-    pub fn if_not_exist(self, b: bool) -> Self {
-        self.map(|(args, options, bs)| (args.with_if_not_exist(b), options, bs))
+    pub fn if_not_exists(self, b: bool) -> Self {
+        self.map(|(args, options, bs)| (args.with_if_not_exists(b), options, bs))
     }
 
     /// Set the user defined metadata of the op
diff --git a/core/tests/behavior/async_write.rs b/core/tests/behavior/async_write.rs
index e96cb166eeb7..044de888f8d6 100644
--- a/core/tests/behavior/async_write.rs
+++ b/core/tests/behavior/async_write.rs
@@ -45,7 +45,7 @@ pub fn tests(op: &Operator, tests: &mut Vec<Trial>) {
             test_write_with_content_type,
             test_write_with_content_disposition,
             test_write_with_if_none_match,
-            test_write_with_if_not_exist,
+            test_write_with_if_not_exists,
             test_write_with_user_metadata,
             test_writer_write,
             test_writer_write_with_overwrite,
@@ -648,8 +648,8 @@ pub async fn test_write_with_if_none_match(op: Operator) -> Result<()> {
     Ok(())
 }
 
-/// Write an file with if_not_exist will get a ConditionNotMatch error if file exists.
-pub async fn test_write_with_if_not_exist(op: Operator) -> Result<()> {
+/// Write an file with if_not_exists will get a ConditionNotMatch error if file exists.
+pub async fn test_write_with_if_not_exists(op: Operator) -> Result<()> {
     if !op.info().full_capability().write_with_if_not_exist {
         return Ok(());
     }
@@ -661,7 +661,7 @@ pub async fn test_write_with_if_not_exist(op: Operator) -> Result<()> {
         .expect("write must succeed");
     let res = op
         .write_with(&path, content.clone())
-        .if_not_exist(true)
+        .if_not_exists(true)
         .await;
     assert!(res.is_err());
     assert_eq!(res.unwrap_err().kind(), ErrorKind::ConditionNotMatch);