diff --git a/doc/ale-sql.txt b/doc/ale-sql.txt
index 225ac7df..78d45db8 100644
--- a/doc/ale-sql.txt
+++ b/doc/ale-sql.txt
@@ -44,6 +44,13 @@ g:ale_sql_sqlfluff_options                         *g:ale_sql_sqlfluff_options*
 
   This variable can be set to pass additional options to the sqlfluff linter.
 
+g:ale_sql_sqlfluff_config_file                *g:ale_sql_sqlfluff_config_file*
+                                              *b:ale_sql_sqlfluff_config_file*
+  Type: |String|
+  Default: `'.sqlfluff'`
+
+  This variable can be set to pass config file type to sqlfluff.
+  Either pyproject.toml, setup.cfg, tox.ini, or pep8.ini.
 
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