diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a5fffb0..e864a24 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,5 +21,5 @@ jobs:
           restore-keys: |
             mkdocs-material-
       - run: pip install mkdocs-material 
-      working-directory: ./lecture_note
+      - working-directory: ./lecture_note
       - run: mkdocs gh-deploy --force