diff --git a/.git-hooks/pre-commit b/.git-hooks/pre-commit
index e539335..2a039c0 100755
--- a/.git-hooks/pre-commit
+++ b/.git-hooks/pre-commit
@@ -15,4 +15,15 @@ if [[ "$BRANCH" =~ ^(master|main|develop)$ ]]; then
   echo "You are on branch $BRANCH. Are you sure you want to commit to this branch?"
   echo "If so, commit with -n to bypass the pre-commit hook."
   exit 1
-fi
\ No newline at end of file
+fi
+
+## Avoid large commits
+# https://www.backblaze.com/blog/how-many-bytes-are-in-a-megabyte-really/
+size_limit=$((2 * 2**20)) # 2mbs
+# https://git-scm.com/docs/git-rev-list#Documentation/git-rev-list.txt---disk-usage
+commit_size=$(git rev-list --disk-usage HEAD^..HEAD)
+test "$commit_size" -lt "$size_limit" || (
+  echo "Commit size is too large: $commit_size > $size_limit"
+  echo "Force commit using --no-verify"
+  exit 1
+)