diff --git a/docs/fluent/advanced.md b/docs/fluent/advanced.md
index d1238478..afba669a 100644
--- a/docs/fluent/advanced.md
+++ b/docs/fluent/advanced.md
@@ -174,7 +174,7 @@ var queryDocument = Document()
 queryDocument["name"]["$regex"] = "e"
 queryDocument["name"]["$options"] = "i"
 
-let planets = try Planet.query(on: req.db).filter(.custom(nameDocument)).all()
+let planets = try Planet.query(on: req.db).filter(.custom(queryDocument)).all()
 ```
 
 This will return planets containing 'e' and 'E'. You can also create any other complex RegEx accepted by MongoDB.
diff --git a/docs/fluent/advanced.nl.md b/docs/fluent/advanced.nl.md
index 21a49dae..34af820d 100644
--- a/docs/fluent/advanced.nl.md
+++ b/docs/fluent/advanced.nl.md
@@ -174,7 +174,7 @@ import FluentMongoDriver
 var queryDocument = Document()
 queryDocument["name"]["$regex"] = "e"
 queryDocument["name"]["$options"] = "i"
-let planets = try Planet.query(on: req.db).filter(.custom(nameDocument)).all()
+let planets = try Planet.query(on: req.db).filter(.custom(queryDocument)).all()
 ```
 
 Dit geeft planeten terug die 'e' en 'E' bevatten. U kunt ook elke andere complexe RegEx maken die door MongoDB wordt geaccepteerd.
diff --git a/docs/fluent/advanced.zh.md b/docs/fluent/advanced.zh.md
index 557f1fe9..38d0323c 100644
--- a/docs/fluent/advanced.zh.md
+++ b/docs/fluent/advanced.zh.md
@@ -173,7 +173,7 @@ var queryDocument = Document()
 queryDocument["name"]["$regex"] = "e"
 queryDocument["name"]["$options"] = "i"
 
-let planets = try Planet.query(on: req.db).filter(.custom(nameDocument)).all()
+let planets = try Planet.query(on: req.db).filter(.custom(queryDocument)).all()
 ```
 
 这将返回包含 'e' 和 'E' 的行星。你还可以创建 MongoDB 接受的任何其他复杂的 RegEx。