diff --git a/core/src/main/scala/com/avsystem/commons/misc/Bidirectional.scala b/core/src/main/scala/com/avsystem/commons/misc/Bidirectional.scala
index 4ab928fec..e8968ec01 100644
--- a/core/src/main/scala/com/avsystem/commons/misc/Bidirectional.scala
+++ b/core/src/main/scala/com/avsystem/commons/misc/Bidirectional.scala
@@ -1,7 +1,16 @@
 package com.avsystem.commons
 package misc
 
-/** Creates reversed partial function. */
+/** Creates reversed partial function.
+  *
+  * @deprecated
+  *   `Bidirectional` is being removed in the Scala 3 release of scala-commons. The whitebox macro has no Scala 3
+  *   counterpart; write the reversed `PartialFunction` manually at call sites.
+  */
+@deprecated(
+  "Bidirectional will be removed in the Scala 3 release of scala-commons. Write the reversed PartialFunction manually.",
+  since = "2.29.0",
+)
 object Bidirectional {
   def apply[A, B](pf: PartialFunction[A, B]): (PartialFunction[A, B], PartialFunction[B, A]) =
     macro com.avsystem.commons.macros.misc.BidirectionalMacro.impl[A, B]