diff --git a/man2/wait.2 b/man2/wait.2
index cae638786..5092b404a 100644
--- a/man2/wait.2
+++ b/man2/wait.2
@@ -535,6 +535,14 @@ flag is automatically implied if the child is being ptraced.
 is actually a library function that (in glibc) is implemented as a call to
 .BR wait4 (2).
 
+On some architectures, there is no
+.BR waitpid ()
+system call;
+.\" e.g., i386 has the system call, but not x86-64
+instead, this interface is implemented via a C library
+wrapper function that calls
+.BR wait4 (2).
+
 The raw
 .BR waitid ()
 system call takes a fifth argument, of type