--- a/package-data-list.lisp-expr
+++ b/package-data-list.lisp-expr
@@ -607,6 +607,9 @@
 
                ;; Not an atomic operation, but should be used with them
                "SPIN-LOOP-HINT"
+
+               ;; Waiting for arbitrary events.
+               "WAIT-FOR"
 
                ;; Time related things
                "CALL-WITH-TIMING"