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diff --git a/docs/content/doc/advanced/config-cheat-sheet.en-us.md b/docs/content/doc/advanced/config-cheat-sheet.en-us.md
index 2fbfdde6bd..043c7e0d43 100644
--- a/docs/content/doc/advanced/config-cheat-sheet.en-us.md
+++ b/docs/content/doc/advanced/config-cheat-sheet.en-us.md
@@ -666,7 +666,7 @@ Define allowed algorithms and their minimum key length (use -1 to disable a type
- Enabling dummy will ignore all settings except `ENABLED`, `SUBJECT_PREFIX` and `FROM`.
- `SENDMAIL_PATH`: **sendmail**: The location of sendmail on the operating system (can be
command or full path).
-- `SENDMAIL_ARGS`: **_empty_**: Specify any extra sendmail arguments.
+- `SENDMAIL_ARGS`: **_empty_**: Specify any extra sendmail arguments. (NOTE: you should be aware that email addresses can look like options - if your `sendmail` command takes options you must set the option terminator `--`)
- `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]`