diff --git a/src/tn3270-sharp/tn3270-sharp.cs b/src/tn3270-sharp/tn3270-sharp.cs
index c5d05a3..f31f71e 100644
--- a/src/tn3270-sharp/tn3270-sharp.cs
+++ b/src/tn3270-sharp/tn3270-sharp.cs
@@ -27,6 +27,7 @@
  *
  * Referências:
  *
+ * https://msdn.microsoft.com/en-us/library/5ast78ax.aspx
  *
  */
 
--
libgit2 0.21.2