diff --git a/.github/workflows/genai_python_lib.yml b/.github/workflows/genai_python_lib.yml
index a3003aff9..67f427ea7 100644
--- a/.github/workflows/genai_python_lib.yml
+++ b/.github/workflows/genai_python_lib.yml
@@ -17,6 +17,7 @@ jobs:
       - run: source ./ov/setupvars.sh && cmake --build ./build/ --config Release -j
       # GitHub Actions already provides what is listed in ./requirements-build.txt but the internal
       # build system doesn't. Install ./requirements-build.txt to detect possible conflicts.
+      # Use Unix Makefiles because the defaut Ninja fails for CentOS7.
       - run: source ./ov/setupvars.sh && CMAKE_GENERATOR="Unix Makefiles" python -m pip install ./thirdparty/openvino_tokenizers/[transformers] -r ./requirements-build.txt --pre --extra-index-url https://storage.openvinotoolkit.org/simple/wheels/nightly
       - run: PYTHONPATH=./src/python/ python -c "from openvino_genai import LLMPipeline"
       - run: source ./ov/setupvars.sh && CMAKE_BUILD_PARALLEL_LEVEL="" python -m pip install .