diff --git a/.framework/java/backend/src/main/java/io/spring/core/comment/Comment.java b/.framework/java/backend/src/main/java/io/spring/core/comment/Comment.java
index a7a6bc4b..ecfcfa1e 100644
--- a/.framework/java/backend/src/main/java/io/spring/core/comment/Comment.java
+++ b/.framework/java/backend/src/main/java/io/spring/core/comment/Comment.java
@@ -12,14 +12,14 @@
 public class Comment {
   private String id;
   private String body;
-  private String userId;
+  private String sellerId;
   private String itemId;
   private DateTime createdAt;
 
-  public Comment(String body, String userId, String itemId) {
+  public Comment(String body, String sellerId, String itemId) {
     this.id = UUID.randomUUID().toString();
     this.body = body;
-    this.userId = userId;
+    this.sellerId = sellerId;
     this.itemId = itemId;
     this.createdAt = new DateTime();
   }
diff --git a/.framework/java/backend/src/main/java/io/spring/core/service/AuthorizationService.java b/.framework/java/backend/src/main/java/io/spring/core/service/AuthorizationService.java
index bb7fba2d..080e7428 100644
--- a/.framework/java/backend/src/main/java/io/spring/core/service/AuthorizationService.java
+++ b/.framework/java/backend/src/main/java/io/spring/core/service/AuthorizationService.java
@@ -10,6 +10,6 @@ public static boolean canWriteItem(User user, Item item) {
   }
 
   public static boolean canWriteComment(User user, Item item, Comment comment) {
-    return user.getId().equals(item.getSellerId()) || user.getId().equals(comment.getUserId());
+    return user.getId().equals(item.getSellerId()) || user.getId().equals(comment.getSellerId());
   }
 }
diff --git a/.framework/java/backend/src/main/resources/db/migration/V1__create_tables.sql b/.framework/java/backend/src/main/resources/db/migration/V1__create_tables.sql
index d2838d07..1a5b612f 100644
--- a/.framework/java/backend/src/main/resources/db/migration/V1__create_tables.sql
+++ b/.framework/java/backend/src/main/resources/db/migration/V1__create_tables.sql
@@ -44,7 +44,7 @@ create table comments (
   id varchar(255) primary key,
   body text,
   item_id varchar(255),
-  user_id varchar(255),
+  seller_id varchar(255),
   created_at TIMESTAMP NOT NULL,
   updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
 );
diff --git a/.framework/java/backend/src/main/resources/mapper/CommentMapper.xml b/.framework/java/backend/src/main/resources/mapper/CommentMapper.xml
index 4f112826..c715304b 100644
--- a/.framework/java/backend/src/main/resources/mapper/CommentMapper.xml
+++ b/.framework/java/backend/src/main/resources/mapper/CommentMapper.xml
@@ -2,11 +2,11 @@
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
 <mapper namespace="io.spring.infrastructure.mybatis.mapper.CommentMapper">
     <insert id="insert">
-        insert into comments(id, body, user_id, item_id, created_at, updated_at)
+        insert into comments(id, body, seller_id, item_id, created_at, updated_at)
         values (
           #{comment.id},
           #{comment.body},
-          #{comment.userId},
+          #{comment.sellerId},
           #{comment.itemId},
           #{comment.createdAt},
           #{comment.createdAt}
@@ -19,7 +19,7 @@
         select
           id commentId,
           body commentBody,
-          user_id commentUserId,
+          seller_id commentSellerId,
           item_id commentItemId,
           created_at commentCreatedAt
         from comments
@@ -28,7 +28,7 @@
     <resultMap id="comment" type="io.spring.core.comment.Comment">
         <id column="commentId" property="id"/>
         <result column="commentBody" property="body"/>
-        <result column="commentUserId" property="userId"/>
+        <result column="commentSellerId" property="sellerId"/>
         <result column="commentItemId" property="itemId"/>
         <result column="commentCreatedAt" property="createdAt"/>
     </resultMap>
diff --git a/.framework/java/backend/src/main/resources/mapper/CommentReadService.xml b/.framework/java/backend/src/main/resources/mapper/CommentReadService.xml
index 2681aa6b..cebb77e2 100644
--- a/.framework/java/backend/src/main/resources/mapper/CommentReadService.xml
+++ b/.framework/java/backend/src/main/resources/mapper/CommentReadService.xml
@@ -10,7 +10,7 @@
         <include refid="io.spring.infrastructure.mybatis.readservice.ItemReadService.profileColumns"/>
         from comments C
         left join users U
-        on C.user_id = U.id
+        on C.seller_id = U.id
     </sql>
 
     <select id="findById" resultMap="transfer.data.commentData">