oauth2: clarify docs on Exchange (nil context isn't ok)
Fixes golang/oauth2#100
Change-Id: I28afb4f02b817ffd0ff91fb10bfca5306d2c21c6
Reviewed-on: https://go-review.googlesource.com/7615
Reviewed-by: Burcu Dogan <jbd@google.com>
diff --git a/oauth2.go b/oauth2.go
index 6ea3fd6..f799eda 100644
--- a/oauth2.go
+++ b/oauth2.go
@@ -155,7 +155,7 @@
// to the Redirect URI (the URL obtained from AuthCodeURL).
//
// The HTTP client to use is derived from the context.
-// If nil, http.DefaultClient is used.
+// If a client is not provided via the context, http.DefaultClient is used.
//
// The code will be in the *http.Request.FormValue("code"). Before
// calling Exchange, be sure to validate FormValue("state").
