diff --git a/spawn-fcgi.c b/spawn-fcgi.c
index f67f71a..3789487 100644
--- a/spawn-fcgi.c
+++ b/spawn-fcgi.c
@@ -75,7 +75,7 @@ typedef struct {
 	gchar *pid_file;
 	gboolean no_fork;
 	gboolean show_version;
-	gboolean keep_fds, close_fds; /* keep/close STDIN/STDOUT */
+	gboolean keep_fds, close_fds; /* keep/close STDOUT/STDERR */
 
 	gchar *chroot;
 	gchar *uid, *gid;
@@ -347,6 +347,7 @@ int drop_priv() {
 	return 0;
 }
 
+/* move a fd to another and close the old one */
 void move2fd(int srcfd, int dstfd) {
 	if (srcfd != dstfd) {
 		close(dstfd);
@@ -355,6 +356,7 @@ void move2fd(int srcfd, int dstfd) {
 	}
 }
 
+/* replace an fd with /dev/null */
 void move2devnull(int fd) {
 	move2fd(open("/dev/null", O_RDWR), fd);
 }