docs update

README

diff --git a/README b/README
index 77f46dd..974212b 100644
--- a/README
+++ b/README
@@ -62,6 +62,9 @@
      return c.Done()
  }
 
+For an example of a non-trivial code base using this library, see
+gopkg.in/gcfg.v1
+
 Rules for using warnings
 
  - ensure that warnings are programmatically distinguishable from fatal

warnings.go

diff --git a/warnings.go b/warnings.go
index 5b57f43..b849d1e 100644
--- a/warnings.go
+++ b/warnings.go
@@ -57,6 +57,9 @@
 //      return c.Done()
 //  }
 //
+// For an example of a non-trivial code base using this library, see
+// gopkg.in/gcfg.v1
+//
 // Rules for using warnings
 //
 //  - ensure that warnings are programmatically distinguishable from fatal