diff --git a/newlib/libc/sys/linux/process.c b/newlib/libc/sys/linux/process.c
index 8ae58b0c5..52336f3ac 100644
--- a/newlib/libc/sys/linux/process.c
+++ b/newlib/libc/sys/linux/process.c
@@ -21,6 +21,9 @@ _syscall0(pid_t,setsid)
 
 weak_alias(__libc_getpid,__getpid);
 
+/* Here we implement vfork in terms of fork, since
+ * Linux's vfork system call is not reliable.
+ */
 pid_t vfork(void)
 {
   pid_t pid;