added a comment to spawn

diff --git a/util.c b/util.c
index e19e3e9..91df00b 100644 (file)
--- a/util.c
+++ b/util.c
@@ -51,6 +51,7 @@ spawn(Arg *arg)
 
        if(!arg->cmd)
                return;
+       /* the double-fork construct avoids zombie processes */
        if(fork() == 0) {
                if(fork() == 0) {
                        if(dpy)