diff --git a/knots/timeout.scm b/knots/timeout.scm
index 8f8a2fb..552d079 100644
--- a/knots/timeout.scm
+++ b/knots/timeout.scm
@@ -31,6 +31,9 @@
   #:use-module (fibers operations)
   #:export (with-fibers-timeout
 
+            wait-until-port-readable-operation
+            wait-until-port-writable-operation
+
             &port-timeout
             port-timeout-error?