diff --git a/SlackPrNotification.js b/SlackPrNotification.js
index 90d3051..5833318 100644
--- a/SlackPrNotification.js
+++ b/SlackPrNotification.js
@@ -10,7 +10,7 @@ var authorName = process.env.PULL_REQUEST_AUTHOR_NAME;
 var authorIconUrl = process.env.PULL_REQUEST_AUTHOR_ICON_URL;
 var compareBranchName = process.env.PULL_REQUEST_COMPARE_BRANCH_NAME;
 var baseBranchName = process.env.PULL_REQUEST_BASE_BRANCH_NAME;
-var sendHereMention = process.env.IS_SEND_HERE_MENTION ? "<!here>\n" : "";
+var sendHereMention = process.env.IS_SEND_HERE_MENTION.toLowerCase() === "true" ? "<!here>\n" : "";
 var message = {
     blocks: [
         {
diff --git a/SlackPrNotification.ts b/SlackPrNotification.ts
index 4923348..34b5ef5 100644
--- a/SlackPrNotification.ts
+++ b/SlackPrNotification.ts
@@ -11,7 +11,7 @@ const authorIconUrl: string = process.env.PULL_REQUEST_AUTHOR_ICON_URL;
 const compareBranchName: string = process.env.PULL_REQUEST_COMPARE_BRANCH_NAME;
 const baseBranchName: string = process.env.PULL_REQUEST_BASE_BRANCH_NAME;
 
-const sendHereMention: string = process.env.IS_SEND_HERE_MENTION ? "<!here>\n" : "";
+const sendHereMention: string = process.env.IS_SEND_HERE_MENTION.toLowerCase() === "true" ? "<!here>\n" : "";
 
 const message: Object = {
     blocks: [