diff --git a/doc/advanced/config-cheat-sheet.en-us.md b/doc/advanced/config-cheat-sheet.en-us.md
index 02a61fe4..247ea935 100644
--- a/doc/advanced/config-cheat-sheet.en-us.md
+++ b/doc/advanced/config-cheat-sheet.en-us.md
@@ -667,6 +667,7 @@ Define allowed algorithms and their minimum key length (use -1 to disable a type
    command or full path).
 - `SENDMAIL_ARGS`: **_empty_**: Specify any extra sendmail arguments.
 - `SENDMAIL_TIMEOUT`: **5m**: default timeout for sending email through sendmail
+- `SENDMAIL_CONVERT_CRLF`: **true**: Most versions of sendmail prefer LF line endings rather than CRLF line endings. Set this to false if your version of sendmail requires CRLF line endings.
 - `SEND_BUFFER_LEN`: **100**: Buffer length of mailing queue. **DEPRECATED** use `LENGTH` in `[queue.mailer]`
 
 ## Cache (`cache`)