diff --git a/developer/bin/project_stats b/developer/bin/project_stats
index e01444ccb4..25dfe64c13 100755
--- a/developer/bin/project_stats
+++ b/developer/bin/project_stats
@@ -76,8 +76,13 @@ _homebrew_cask_project_stats () {
     printf "  any\t"
     $git_log_cmd -- .           | /usr/bin/sort | /usr/bin/uniq | /usr/bin/wc -l
     if [[ "$start_object" != "$initial_commit" ]]; then
-        printf "\nAll-time contributors\t"
-        git log --no-merges --format='%ae' ${initial_commit}..${end_object} -- . | /usr/bin/sort | /usr/bin/uniq | /usr/bin/wc -l
+        local alltime_contribs="$(git log --no-merges --format='%ae' ${initial_commit}..${end_object} -- . | /usr/bin/sort | /usr/bin/uniq | /usr/bin/wc -l)"
+        local prior_contribs="$(git log --no-merges --format='%ae' ${initial_commit}..${start_object} -- . | /usr/bin/sort | /usr/bin/uniq | /usr/bin/wc -l)"
+        # arithmetic removes whitespace
+        ((alltime_contribs += 0))
+        ((new_contribs      = alltime_contribs - prior_contribs))
+        printf "\nAll-time contributors\t$alltime_contribs\n"
+        printf "New contributors since $start_object\t$new_contribs\n"
     fi
 
     printf "\n"