diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6ac2cb8e..f99622f8 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -13,6 +13,7 @@ jobs:
       - name: Install smith toolchain
         run: |
           sudo add-apt-repository -y ppa:silnrsi/smith-py3
+          sudo add-apt-repository -y ppa:sile-typesetter/sile
           # sudo add-apt-repository -y ppa:fontforge/fontforge
           # sudo add-apt-repository -y ppa:jonathonf/texlive-2019
           # sudo add-apt-repository -y ppa:git-core/ppa
@@ -23,7 +24,7 @@ jobs:
           # sudo apt-get install libjson-perl libtext-csv-perl libharfbuzz-bin -y
           sudo apt-get install smith-font -y --no-install-recommends
           # sudo apt-get install python3-pip python3-setuptools -y
-          # sudo pip3 install --upgrade git+https://github.com/googlefonts/fontbakery.git@master#egg=fontbakery
+          # sudo pip3 install --upgrade git+https://github.com/googlefonts/fontbakery.git@main#egg=fontbakery
       - name: configure / build / test / release
         run: |
           # smith version
diff --git a/documentation/ThiruValluvar-features.odt b/documentation/ThiruValluvar-features.odt
index 20df3120..80b7e6c3 100644
Binary files a/documentation/ThiruValluvar-features.odt and b/documentation/ThiruValluvar-features.odt differ
diff --git a/documentation/ThiruValluvar-features.pdf b/documentation/ThiruValluvar-features.pdf
index 8661c4e0..33cfa62d 100644
Binary files a/documentation/ThiruValluvar-features.pdf and b/documentation/ThiruValluvar-features.pdf differ