diff --git a/docs/dev_guides/how-to-create-an-analyzer.md b/docs/dev_guides/how-to-create-an-analyzer.md
index bd8350026..7ed2c7b6d 100644
--- a/docs/dev_guides/how-to-create-an-analyzer.md
+++ b/docs/dev_guides/how-to-create-an-analyzer.md
@@ -192,7 +192,7 @@ accepts the following datatypes:
 - hash
 - ip
 - mail
-- mail_subject
+- mail-subject
 - other
 - regexp
 - registry
@@ -564,4 +564,4 @@ Something does not work as expected? No worries, we got you covered. Please
 join our [user forum](https://groups.google.com/a/thehive-project.org/forum/#!forum/users),
  contact us on [Gitter](https://gitter.im/TheHive-Project/TheHive), or send us
  an email at [support@thehive-project.org](mailto:support@thehive-project
- .org). We are here to help.
\ No newline at end of file
+ .org). We are here to help.