diff --git a/doc/10-icinga-template-library.md b/doc/10-icinga-template-library.md
index cf73b0ca7..4a4800c69 100644
--- a/doc/10-icinga-template-library.md
+++ b/doc/10-icinga-template-library.md
@@ -732,6 +732,7 @@ Name			| Description
 ------------------------|---------------------------------------------------------------
 mysql_hostname		| **Optional.** Host name, IP Address, or unix socket (must be an absolute path).
 mysql_port		| **Optional.** Port number (default: 3306).
+mysql_socket		| **Optional.** Use the specified socket (has no effect if `mysql_hostname` is used).
 mysql_ignore_auth	| **Optional.** Ignore authentication failure and check for mysql connectivity only.
 mysql_database		| **Optional.** Check database with indicated name.
 mysql_file		| **Optional.** Read from the specified client options file.