diff --git a/src/main/java/com/dteam/momentree/api/auth/AuthController.java b/src/main/java/com/dteam/momentree/api/auth/AuthController.java
index 675325a..39dacca 100644
--- a/src/main/java/com/dteam/momentree/api/auth/AuthController.java
+++ b/src/main/java/com/dteam/momentree/api/auth/AuthController.java
@@ -3,6 +3,7 @@
 import com.dteam.momentree.api.auth.dto.SignInRequest;
 import com.dteam.momentree.api.auth.dto.SignInResponse;
 import com.dteam.momentree.application.auth.AuthService;
+import io.swagger.v3.oas.annotations.Operation;
 import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
@@ -15,6 +16,11 @@ public class AuthController {
     private final AuthService authService;
 
     @PostMapping("/sign-in")
+    @Operation(summary = "로그인 API",
+            description = """
+            - **loginId**는 가입한 ID명입니다.
+            - **password**에 비밀번호를 작성하시면 됩니다.
+            """)
     public SignInResponse signIn(@RequestBody SignInRequest request){
         return authService.signIn(request);
     }
diff --git a/src/main/java/com/dteam/momentree/api/auth/SignUpController.java b/src/main/java/com/dteam/momentree/api/auth/SignUpController.java
index 2a171b1..ee61780 100644
--- a/src/main/java/com/dteam/momentree/api/auth/SignUpController.java
+++ b/src/main/java/com/dteam/momentree/api/auth/SignUpController.java
@@ -2,6 +2,7 @@
 
 import com.dteam.momentree.api.auth.dto.SignUpRequest;
 import com.dteam.momentree.application.auth.SignUpService;
+import io.swagger.v3.oas.annotations.Operation;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -17,6 +18,11 @@ public class SignUpController {
     private final SignUpService signUpService;
 
     @PostMapping
+    @Operation(summary = "회원가입 API",
+    description = """
+            - **loginId**는 가입할 ID명입니다.
+            - **password**에 비밀번호를 작성하시면 됩니다.
+            """)
     public Long signUp(@RequestBody @Valid SignUpRequest request){
         return signUpService.signUp(request);
     }
diff --git a/src/main/java/com/dteam/momentree/api/diary/DiaryController.java b/src/main/java/com/dteam/momentree/api/diary/DiaryController.java
index 97ddb20..67069b2 100644
--- a/src/main/java/com/dteam/momentree/api/diary/DiaryController.java
+++ b/src/main/java/com/dteam/momentree/api/diary/DiaryController.java
@@ -26,7 +26,12 @@ public class DiaryController {
     private final DiaryService diaryService;
 
     @PostMapping("/create/{day}")
-    @Operation(summary = "일기 생성 API", description = "특정 날짜에 대한 일기를 생성합니다.")
+    @Operation(summary = "일기 생성 API",
+            description = """
+                특정 날짜에 대한 일기를 작성하는 API입니다.
+                - **content**는 일기 내용을 나타냅니다.
+                - **OpenStatus**값에 OPEN은 공개상태, CLOSED는 비공개상태입니다.
+                """)
     public ResponseEntity<DiaryResponse> createDiary(
             @RequestBody @Valid DiaryRequest request,
             @Parameter(description = "일기를 생성할 날짜 (1~31)", example = "1")
@@ -51,7 +56,9 @@ public ResponseEntity<ReadDiaryResponse> getDiaryByDay(
     @PatchMapping("/{day}/assign-location/{location}")
     @Operation(summary = "특정 위치에 회원별 일기 배치 API")
     public ResponseEntity<Void> assignLocationToDiary(
+            @Parameter(description = "배치할 일기의 날짜 (1~31)", example = "1")
             @PathVariable int day,
+            @Parameter(description = "트리에 배치할 영역 (1~18)", example = "1")
             @PathVariable Long location,
             @Auth LoginUser loginUser) {
         diaryService.assignLocationToDiary(day, location, loginUser.getUserId());
@@ -61,6 +68,7 @@ public ResponseEntity<Void> assignLocationToDiary(
     @PatchMapping("/unassign-location/{location}")
     @Operation(summary = "특정 위치의 회원별 일기 해제 API")
     public ResponseEntity<Void> unassignLocation(
+            @Parameter(description = "트리에 배치를 해체할 영역 (1~18)", example = "1")
             @PathVariable Long location,
             @Auth LoginUser loginUser) {
         diaryService.unassignLocation(location, loginUser.getUserId());
@@ -75,6 +83,11 @@ public ResponseEntity<List<ReadDiaryResponse>> getUnassignedDiaries(@Auth LoginU
     }
 
     @PostMapping("/update")
+    @Operation(summary = "일기의 내용 수정 API", description = """
+            일기 내용을 수정하는 API 입니다.
+            - **id**는 해당 일기의 고유 ID값입니다.
+            - **content**는 일기의 수정할 내용을 적는 곳입니다.
+            """)
     public void update(@Auth LoginUser user, @RequestBody DiaryUpdateRequest updateRequest) {
         diaryService.update(user.getUserId(), updateRequest);
     }
diff --git a/src/main/java/com/dteam/momentree/api/diary/dto/DiaryRequest.java b/src/main/java/com/dteam/momentree/api/diary/dto/DiaryRequest.java
index 7035817..bd7b706 100644
--- a/src/main/java/com/dteam/momentree/api/diary/dto/DiaryRequest.java
+++ b/src/main/java/com/dteam/momentree/api/diary/dto/DiaryRequest.java
@@ -1,15 +1,18 @@
 package com.dteam.momentree.api.diary.dto;
 
 import com.dteam.momentree.domain.diary.OpenStatus;
+import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.constraints.NotNull;
 import lombok.Getter;
 
 @Getter
 public class DiaryRequest {
 
+    @Schema(description = "일기 내용", example = "오늘의 일기 내용입니다.")
     @NotNull
     private String content;
 
+    @Schema(description = "공개 상태 (OPEN: 모두공개, CLOSED: 비공개)", example = "OPEN")
     @NotNull
     private OpenStatus openStatus;