diff --git a/base/process.jl b/base/process.jl
index 0c703eacdd3123..a61046d6fdd638 100644
--- a/base/process.jl
+++ b/base/process.jl
@@ -749,6 +749,9 @@ kill(p::Process) = kill(p, SIGTERM)
     getpid(process) -> Int32
 
 Get the child process ID, if it still exists.
+
+!!! compat "Julia 1.1"
+    This function requires at least Julia 1.1.
 """
 function Libc.getpid(p::Process)
     ppid = Int32(0)