diff --git a/src/rcore/modes.rs b/src/rcore/modes.rs
index 9d08573..6ab69b8 100644
--- a/src/rcore/modes.rs
+++ b/src/rcore/modes.rs
@@ -301,10 +301,13 @@ where
 pub struct RegularMode;
 
 impl Mode for RegularMode {
+    /// Discards the parser.
     type ParseSuccess<A, I> = A;
 
+    /// Tries to extend the value.
     type ExtensionResult<A, E> = Result<A, E>;
 
+    /// Allows extending the value.
     type ExtensionSource<A> = A;
 
     fn bind<A0, A1, E, I>(