1 files changed, 4 insertions, 0 deletions
diff --git a/src/test/scala/chiselTests/AnalogIntegrationSpec.scala b/src/test/scala/chiselTests/AnalogIntegrationSpec.scala
index 3af54d1d..7478f2eb 100644
--- a/src/test/scala/chiselTests/AnalogIntegrationSpec.scala
+++ b/src/test/scala/chiselTests/AnalogIntegrationSpec.scala
@@ -31,6 +31,10 @@ class AnalogBlackBox(index: Int) extends BlackBox(Map("index" -> index)) {
   val io = IO(new AnalogBlackBoxIO(1))
 }
 
+// This interface exists to give a common interface type for AnalogBlackBoxModule and
+// AnalogBlackBoxWrapper. This is the standard way to deal with the deprecation and removal of the
+// Module.io virtual method (same for BlackBox.io).
+// See https://github.com/freechipsproject/chisel3/pull/1550 for more information
 trait AnalogBlackBoxModuleIntf extends Module {
   def io: AnalogBlackBoxIO
 }