Disclaimer for step
diff --git a/src/parse.rs b/src/parse.rs
index dfca478..7b98470 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -380,6 +380,10 @@
/// Speculatively parses tokens from this parse stream, advancing the
/// position of this stream only if parsing succeeds.
///
+ /// This is a powerful low-level API used for defining the `Parse` impls of
+ /// the basic built-in token types. It is not something that will be used
+ /// widely outside of the Syn codebase.
+ ///
/// # Example
///
/// ```