diff --git a/base/locks.jl b/base/locks.jl
index 425785b910fda..78454f3d38779 100644
--- a/base/locks.jl
+++ b/base/locks.jl
@@ -246,6 +246,9 @@ Create a level-triggered event source. Tasks that call [`wait`](@ref) on an
 `Event` are suspended and queued until `notify` is called on the `Event`.
 After `notify` is called, the `Event` remains in a signaled state and
 tasks will no longer block when waiting for it.
+
+!!! compat "Julia 1.1"
+    This functionality requires at least Julia 1.1.
 """
 mutable struct Event
     lock::Mutex