$GIT_DIR/HEAD is prefixed with an asterisk `*` character while other
heads are prefixed with a `!` character.
-Following these N lines, one-line log for each commit is
+Following these N lines, a one-line log for each commit is
displayed, indented N places. If a commit is on the I-th
branch, the I-th indentation character shows a `+` sign;
otherwise it shows a space. Merge commits are denoted by