diff --git a/dist/index.js b/dist/index.js
index cb31a1c4..f96c55c0 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -130,9 +130,10 @@ function appendSeparatorTo(body, separator) {
 }
 function truncateBody(body) {
     // 65536 characters is the maximum allowed for issue comments.
+    const truncateWarning = '...*[Comment body truncated]*';
     if (body.length > 65536) {
         core.warning(`Comment body is too long. Truncating to 65536 characters.`);
-        return body.substring(0, 65536);
+        return body.substring(0, 65536 - truncateWarning.length) + truncateWarning;
     }
     return body;
 }
diff --git a/src/create-or-update-comment.ts b/src/create-or-update-comment.ts
index 80880adf..f6be7b93 100644
--- a/src/create-or-update-comment.ts
+++ b/src/create-or-update-comment.ts
@@ -120,9 +120,10 @@ function appendSeparatorTo(body: string, separator: string): string {
 
 function truncateBody(body: string) {
   // 65536 characters is the maximum allowed for issue comments.
+  const truncateWarning = '...*[Comment body truncated]*'
   if (body.length > 65536) {
     core.warning(`Comment body is too long. Truncating to 65536 characters.`)
-    return body.substring(0, 65536)
+    return body.substring(0, 65536 - truncateWarning.length) + truncateWarning
   }
   return body
 }