diff --git a/src/rcore/modes.rs b/src/rcore/modes.rs
index 13b2a8f..c724345 100644
--- a/src/rcore/modes.rs
+++ b/src/rcore/modes.rs
@@ -62,6 +62,11 @@ pub trait Mode {
         f: impl FnOnce(E0) -> E1,
     ) -> Self::ExtensionResult<A, E1>;
 
+    /// Do something with the extension result, potentially failing.
+    ///
+    /// Useful for chaining extension after [`InliningFactory`].
+    ///
+    /// [`InliningFactory`]: crate::rstd::inlining::InliningFactory
     fn xbind<A0, A1, E>(
         result: Self::ExtensionResult<A0, E>,
         f: impl FnOnce(A0) -> Result<A1, E>,