diff --git a/errgroup/errgroup.go b/errgroup/errgroup.go
index a4ea5d1..f8c3c09 100644
--- a/errgroup/errgroup.go
+++ b/errgroup/errgroup.go
@@ -18,7 +18,7 @@ import (
type token struct{}
// A Group is a collection of goroutines working on subtasks that are part of
-// the same overall task.
+// the same overall task. A Group should not be reused for different tasks.
//
// A zero Group is valid, has no limit on the number of active goroutines,
// and does not cancel on error.
@@ -61,6 +61,7 @@ func (g *Group) Wait() error {
}
// Go calls the given function in a new goroutine.
+// The first call to Go must happen before a Wait.
// It blocks until the new goroutine can be added without the number of
// active goroutines in the group exceeding the configured limit.
//
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