diff --git a/errgroup/errgroup.go b/errgroup/errgroup.go
index 948a3ee..b832259 100644
--- a/errgroup/errgroup.go
+++ b/errgroup/errgroup.go
@@ -118,6 +118,7 @@ func (g *Group) TryGo(f func() error) bool {
 
 // SetLimit limits the number of active goroutines in this group to at most n.
 // A negative value indicates no limit.
+// A limit of zero will prevent any new goroutines from being added.
 //
 // Any subsequent call to the Go method will block until it can add an active
 // goroutine without exceeding the configured limit.