diff --git a/src/ast/mod.rs b/src/ast/mod.rs
index e378b8cd4..dbe0fb10f 100644
--- a/src/ast/mod.rs
+++ b/src/ast/mod.rs
@@ -3653,7 +3653,7 @@ impl fmt::Display for CloseCursor {
 pub struct Function {
     pub name: ObjectName,
     pub args: Vec<FunctionArg>,
-    // e.g. `x > 5` in `COUNT(x) FILTER (WHERE x > 5)`
+    /// e.g. `x > 5` in `COUNT(x) FILTER (WHERE x > 5)`
     pub filter: Option<Box<Expr>>,
     pub over: Option<WindowType>,
     // aggregate functions may specify eg `COUNT(DISTINCT x)`