diff --git a/lisp/subr.el b/lisp/subr.el
index 8a1792ad8b78..c3524ef1fccb 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -2001,6 +2001,9 @@ PROGRAM is the program file name.  It is searched for in `exec-path'
 \(which see).  If nil, just associate a pty with the buffer.  Remaining
 arguments are strings to give program as arguments.
 
+PROGRAM-ARGS are strings that specify command line arguments for the
+subprocess.
+
 If you want to separate standard output from standard error, use
 `make-process' or invoke the command through a shell and redirect
 one of them using the shell syntax."