diff --git a/CombineExt.xcodeproj/project.pbxproj b/CombineExt.xcodeproj/project.pbxproj
index ace2f32..8951eb3 100644
--- a/CombineExt.xcodeproj/project.pbxproj
+++ b/CombineExt.xcodeproj/project.pbxproj
@@ -28,6 +28,7 @@
 		63FEBC9527E9FE9000E934AD /* FlatMapFirstTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 63FEBC9427E9FE9000E934AD /* FlatMapFirstTests.swift */; };
 		712E36C82711B79000A2AAFE /* RetryWhen.swift in Sources */ = {isa = PBXBuildFile; fileRef = 712E36C72711B79000A2AAFE /* RetryWhen.swift */; };
 		7182326F26DAAF230026BAD3 /* RetryWhenTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7182326E26DAAF230026BAD3 /* RetryWhenTests.swift */; };
+		86569294292B342A0027D795 /* Publisher+OptionalSink.swift in Sources */ = {isa = PBXBuildFile; fileRef = 86569293292B342A0027D795 /* Publisher+OptionalSink.swift */; };
 		BF330EF924F20032001281FC /* Timer.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF330EF824F20032001281FC /* Timer.swift */; };
 		BF330EFB24F20080001281FC /* Lock.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF330EFA24F20080001281FC /* Lock.swift */; };
 		BF3D3B5D253B83F300D830ED /* IgnoreFailure.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF3D3B5C253B83F300D830ED /* IgnoreFailure.swift */; };
@@ -124,6 +125,7 @@
 		63FEBC9427E9FE9000E934AD /* FlatMapFirstTests.swift */ = {isa = PBXFileReference; indentWidth = 4; lastKnownFileType = sourcecode.swift; path = FlatMapFirstTests.swift; sourceTree = "<group>"; };
 		712E36C72711B79000A2AAFE /* RetryWhen.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = RetryWhen.swift; sourceTree = "<group>"; };
 		7182326E26DAAF230026BAD3 /* RetryWhenTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RetryWhenTests.swift; sourceTree = "<group>"; };
+		86569293292B342A0027D795 /* Publisher+OptionalSink.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Publisher+OptionalSink.swift"; sourceTree = "<group>"; };
 		BF330EF824F20032001281FC /* Timer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Timer.swift; sourceTree = "<group>"; };
 		BF330EFA24F20080001281FC /* Lock.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Lock.swift; sourceTree = "<group>"; };
 		BF3D3B5C253B83F300D830ED /* IgnoreFailure.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = IgnoreFailure.swift; sourceTree = "<group>"; };
@@ -243,6 +245,7 @@
 			isa = PBXGroup;
 			children = (
 				OBJ_12 /* Optional.swift */,
+				86569293292B342A0027D795 /* Publisher+OptionalSink.swift */,
 			);
 			path = Convenience;
 			sourceTree = "<group>";
@@ -646,6 +649,7 @@
 				OBJ_94 /* PrefixDuration.swift in Sources */,
 				63FEBC9327E9FCDB00E934AD /* FlatMapFirst.swift in Sources */,
 				OBJ_95 /* RemoveAllDuplicates.swift in Sources */,
+				86569294292B342A0027D795 /* Publisher+OptionalSink.swift in Sources */,
 				OBJ_96 /* SetOutputType.swift in Sources */,
 				OBJ_97 /* ShareReplay.swift in Sources */,
 				BF45214E259C0C610065E60E /* PrefixWhileBehavior.swift in Sources */,
diff --git a/Sources/Convenience/Publisher+OptionalSink.swift b/Sources/Convenience/Publisher+OptionalSink.swift
new file mode 100644
index 0000000..64ca25f
--- /dev/null
+++ b/Sources/Convenience/Publisher+OptionalSink.swift
@@ -0,0 +1,20 @@
+//
+//  Publisher+OptionalSink.swift
+//  CombineExt
+//
+//  Created by reiley kim on 2022/11/21.
+//
+
+import Foundation
+import Combine
+
+@available(OSX 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
+public extension Publisher {
+    func sink(receiveCompletion: ((Subscribers.Completion<Self.Failure>) -> Void)? = nil,
+                     receiveValue: ((Self.Output) -> Void)? = nil) -> AnyCancellable {
+        let receiveValueClosure: ((Self.Output) -> Void) = receiveValue ?? { _ in }
+        let receiveComletionClosure: ((Subscribers.Completion<Self.Failure>) -> Void) = receiveCompletion ?? { _ in }
+
+        return sink(receiveCompletion: receiveComletionClosure, receiveValue: receiveValueClosure)
+    }
+}