diff --git a/stdlib/Dates/src/periods.jl b/stdlib/Dates/src/periods.jl
index 2af634bdf104c..22c792cb2f333 100644
--- a/stdlib/Dates/src/periods.jl
+++ b/stdlib/Dates/src/periods.jl
@@ -200,6 +200,9 @@ end
     Dates.periods(::CompoundPeriod) -> Vector{Period}
 
 Return the `Vector` of `Period`s that comprise the given `CompoundPeriod`.
+
+!!! compat "Julia 1.7"
+    This function requires Julia 1.7 or later.
 """
 periods(x::CompoundPeriod) = x.periods