1 files changed, 8 insertions, 0 deletions
diff --git a/sqlglot/optimizer/expand_multi_table_selects.py b/sqlglot/optimizer/expand_multi_table_selects.py
index ba562df..86f0c2d 100644
--- a/sqlglot/optimizer/expand_multi_table_selects.py
+++ b/sqlglot/optimizer/expand_multi_table_selects.py
@@ -2,6 +2,14 @@ from sqlglot import exp
 
 
 def expand_multi_table_selects(expression):
+    """
+    Replace multiple FROM expressions with JOINs.
+
+    Example:
+        >>> from sqlglot import parse_one
+        >>> expand_multi_table_selects(parse_one("SELECT * FROM x, y")).sql()
+        'SELECT * FROM x CROSS JOIN y'
+    """
     for from_ in expression.find_all(exp.From):
         parent = from_.parent