This plugin extends the functionality of tpope's fugitive plugin. When
installed, it shows the first line of the commit message for the commit under
the cursor in a :Gblame window.
Install this plugin alongside the existing fugitive plugin. If you don't have a preferred installation method, I recommend installing pathogen.vim, and then simply copy and paste:
cd ~/.vim/bundle
git clone https://github.com/tommcdo/vim-fugitive-blame-ext.git
When running the :Gblame command from fugitive, moving your cursor over lines
in the blame window will display the first line of the commit message at the
bottom of the screen.
There's no documentation for this plugin because there are more words in this sentence than there would be in that help file.