diff --git a/src/rcore/modes.rs b/src/rcore/modes.rs
index fac0066..980d607 100644
--- a/src/rcore/modes.rs
+++ b/src/rcore/modes.rs
@@ -365,10 +365,13 @@ impl Mode for RegularMode {
     }
 }
 
+/// For auto-deriving [`RegularFactory`] from concrete implementations.
 pub trait CRegularFactory<'a, Ctx: Context<'a>>:
     FactoryBase<'a, Ctx> + ImplMode<Mode = RegularMode>
 {
+    /// Concrete implementation of [`RegularFactory::rdeserialize`].
     fn crdeserialize(&self, inctx: impl InCtx<'a, Ctx>) -> ParseResult<'a, Ctx, Self>;
+    /// Concrete implementation of [`RegularFactory::rextend`].
     fn crextend(&self, mentionable: Self::Mtbl, tail: &[u8]) -> ParseResult<'a, Ctx, Self>;
 }