diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 53c45fd..a3216e2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -54,7 +54,9 @@ jobs:
         uses: ./
         with:
           issue-number: ${{ steps.ciff.outputs.issue-number }}
-          comment: '[CI] test ${{ matrix.os }}'
+          comment: |
+            [CI]
+            test ${{ matrix.os }}
           labels: |
             wontfix
             ci-test
diff --git a/action.yml b/action.yml
index b95a4d4..d097152 100644
--- a/action.yml
+++ b/action.yml
@@ -31,7 +31,11 @@ runs:
       shell: bash
       run: |
         if [ -n "${{ inputs.comment }}" ]; then
-          echo comment="--comment \"${{ inputs.comment }}\"" >> $GITHUB_OUTPUT
+          comment="--comment \"${{ inputs.comment }}\""
+          delimiter="$(openssl rand -hex 8)"
+          echo "comment<<$delimiter" >> $GITHUB_OUTPUT
+          echo "$comment" >> $GITHUB_OUTPUT
+          echo "$delimiter" >> $GITHUB_OUTPUT
         fi
 
         if [ "${{ inputs.close-reason }}" == "not_planned" ]; then