diff --git a/README.md b/README.md
index 923e1ba..063e605 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ The core spec of Clyx is mostly stable but the standard library is still a work-
 - Character I/O (implementation-dependent)
 - File I/O (may not support all features on some targets)
 - TCP socket I/O (may not be supported on some targets)
+- Host language interop (may not be supported on some targets, only to be used when nothing else helps)
 - Platform-agnostic [standard library](lib.clx)
 - Ability to include custom modules into the current runtime context (depends on file I/O capabilities)