diff --git a/base/special/trig.jl b/base/special/trig.jl
index 0ebf2c7f6c358..3aa075e09342f 100644
--- a/base/special/trig.jl
+++ b/base/special/trig.jl
@@ -864,6 +864,9 @@ end
     sincospi(x)
 
 Simultaneously compute `sinpi(x)` and `cospi(x)`, where the `x` is in radians.
+
+!!! compat "Julia 1.6"
+    This function requires Julia 1.6 or later.
 """
 function sincospi(x::T) where T<:AbstractFloat
     if !isfinite(x)