add note that vac should work.

change %R to %r

src/cmd/vac/README

diff --git a/src/cmd/vac/README b/src/cmd/vac/README
index bc44b56..c8d68bd 100644
--- a/src/cmd/vac/README
+++ b/src/cmd/vac/README
@@ -1,3 +1,2 @@
-This is very buggered. 
-Just here for reference for now.
+This is somewhat untested but is believed to work.
 

src/cmd/vac/srcload.c

diff --git a/src/cmd/vac/srcload.c b/src/cmd/vac/srcload.c
index 4f48efc..5dec719 100644
--- a/src/cmd/vac/srcload.c
+++ b/src/cmd/vac/srcload.c
@@ -124,7 +124,7 @@
 	r = sourceAlloc(c, u, 0, 0);
 	vtUnlock(u->lk);
 	if(r == nil)
-		sysfatal("could not create root source: %R");
+		sysfatal("could not create root source: %r");
 	return r;
 }
 
@@ -157,7 +157,7 @@
 	}
 	ss = sourceCreate(s, s->psize, s->dsize, 1+frand()>.5, 0);
 	if(ss == nil)
-		fprint(2, "could not create directory: %R\n");
+		fprint(2, "could not create directory: %r\n");
 	if(trace) {
 		int j;
 		for(j=1; j<trace; j++)
@@ -221,7 +221,7 @@
 	for(i=0; i<n; i++) {
 		ss = sourceOpen(s, i, 1);
 		if(ss == nil) {
-fprint(2, "%lud: %R\n", i);
+fprint(2, "%lud: %r\n", i);
 			continue;
 		}
 		Bprint(bout, "\t%lud %d %llud %V\n", i, ss->dir, ss->size, ss->lump->score);

src/cmd/vac/vac.c

diff --git a/src/cmd/vac/vac.c b/src/cmd/vac/vac.c
index a10ce3d..53a66be 100644
--- a/src/cmd/vac/vac.c
+++ b/src/cmd/vac/vac.c
@@ -196,7 +196,7 @@
 	vac(z, argv);
 
 	if(vtsync(z) < 0)
-		fprint(2, "warning: could not ask server to flush pending writes: %R\n");
+		fprint(2, "warning: could not ask server to flush pending writes: %r\n");
 
 	if(statsflag)
 		fprint(2, "files %ld:%ld data %ld:%ld:%ld meta %ld\n", stats.file, stats.sfile,