Clarified peek_slice doc
@@ -33,7 +33,7 @@ pub enum Expr {
Range(String, String),
/// Matches the rule with the given name, e.g. `a`
Ident(String),
- /// Matches a custom part of the stack
+ /// Matches a custom part of the stack, e.g. `PEEK[..]`
PeekSlice(i32, Option<i32>),
/// Positive lookahead; matches expression without making progress, e.g. `&e`
PosPred(Box<Expr>),
