diff --git a/.github/workflows/benchmark.yaml b/.github/workflows/benchmark.yaml
index b640771..39d8659 100644
--- a/.github/workflows/benchmark.yaml
+++ b/.github/workflows/benchmark.yaml
@@ -9,6 +9,7 @@ jobs:
     - uses: actions/checkout@v1
     - name: take benchmarks
       run: |
+        mkdir -p document
         ./benchmark/gendoc.sh | tee document/benchmark.md
     - name: upload to wiki
       uses: SwiftDocOrg/github-wiki-publish-action@v1