diff --git a/doc/administration/config-cheat-sheet.en-us.md b/doc/administration/config-cheat-sheet.en-us.md
index 9bb2533d..9616be58 100644
--- a/doc/administration/config-cheat-sheet.en-us.md
+++ b/doc/administration/config-cheat-sheet.en-us.md
@@ -465,6 +465,7 @@ relation to port exhaustion.
 - `ISSUE_INDEXER_PATH`: **indexers/issues.bleve**: Index file used for issue search; available when ISSUE_INDEXER_TYPE is bleve and elasticsearch. Relative paths will be made absolute against _`AppWorkPath`_.
 
 - `REPO_INDEXER_ENABLED`: **false**: Enables code search (uses a lot of disk space, about 6 times more than the repository size).
+- `REPO_INDEXER_REPO_TYPES`: **sources,forks,mirrors,templates**: Repo indexer units. The items to index could be `sources`, `forks`, `mirrors`, `templates` or any combination of them separated by a comma. If empty then it defaults to `sources` only, as if you'd like to disable fully please see `REPO_INDEXER_ENABLED`.
 - `REPO_INDEXER_TYPE`: **bleve**: Code search engine type, could be `bleve` or `elasticsearch`.
 - `REPO_INDEXER_PATH`: **indexers/repos.bleve**: Index file used for code search.
 - `REPO_INDEXER_CONN_STR`: ****: Code indexer connection string, available when `REPO_INDEXER_TYPE` is elasticsearch. i.e. http://elastic:changeme@localhost:9200