diff --git a/content/v3/repos/commits.md b/content/v3/repos/commits.md
index 120e266015..3bf4a4af0a 100644
--- a/content/v3/repos/commits.md
+++ b/content/v3/repos/commits.md
@@ -17,7 +17,7 @@ The Repo Commits API supports listing, viewing, and comparing commits in a repos
 
 Name | Type | Description
 -----|------|--------------
-`sha`|`string` | SHA or branch to start listing commits from.
+`sha`|`string` | SHA or branch to start listing commits from. Default: the repository’s default branch (usually `master`).
 `path`|`string` | Only commits containing this file path will be returned.
 `author`|`string` | GitHub login or email address by which to filter by commit author.
 `since`|`string` | Only commits after this date will be returned. This is a timestamp in ISO 8601 format: `YYYY-MM-DDTHH:MM:SSZ`.