diff --git a/.github/workflows/ci-catkin.yaml b/.github/workflows/ci-catkin.yaml
index f524192..5d0531a 100644
--- a/.github/workflows/ci-catkin.yaml
+++ b/.github/workflows/ci-catkin.yaml
@@ -46,7 +46,7 @@ jobs:
           then
             echo "ROS_DISTRO=noetic" >> $GITHUB_ENV
             echo "PYTHON_PACKAGE_PREFIX=python3" >> $GITHUB_ENV
-          else
+          else # if [ "${{ matrix.os }}" == "ubuntu-18.04" ]
             echo "ROS_DISTRO=melodic" >> $GITHUB_ENV
             echo "PYTHON_PACKAGE_PREFIX=python" >> $GITHUB_ENV
           fi