diff --git a/Storage/Tape/Formats/CommodoreTAP.cpp b/Storage/Tape/Formats/CommodoreTAP.cpp
index 503f84b40..f574a3fd7 100644
--- a/Storage/Tape/Formats/CommodoreTAP.cpp
+++ b/Storage/Tape/Formats/CommodoreTAP.cpp
@@ -64,7 +64,7 @@ void CommodoreTAP::reset()
 	_current_pulse.type = Pulse::High;
 }
 
-CommodoreTAP::Pulse CommodoreTAP::get_next_pulse()
+Tape::Pulse CommodoreTAP::get_next_pulse()
 {
 	if(_current_pulse.type == Pulse::High)
 	{
diff --git a/Storage/Tape/Formats/CommodoreTAP.hpp b/Storage/Tape/Formats/CommodoreTAP.hpp
index b76055259..7d4a9de17 100644
--- a/Storage/Tape/Formats/CommodoreTAP.hpp
+++ b/Storage/Tape/Formats/CommodoreTAP.hpp
@@ -15,7 +15,7 @@
 namespace Storage {
 
 /*!
-	Provides a @c Tape containing a Commodore-format tape image, which is simply a timed list of zero crossings.
+	Provides a @c Tape containing a Commodore-format tape image, which is simply a timed list of downward-going zero crossings.
 */
 class CommodoreTAP: public Tape {
 	public: