static void mark_reachable(struct commit *commit, unsigned long expire_limit)
{
/*
- * We need to compute if commit on either side of an reflog
+ * We need to compute whether the commit on either side of a reflog
* entry is reachable from the tip of the ref for all entries.
* Mark commits that are reachable from the tip down to the
* time threshold first; we know a commit marked thusly is