diff --git a/Doxyfile b/Doxyfile
index f084e33..9072839 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -31,7 +31,7 @@ PROJECT_NAME           = "Rubber Band Library"
 # This could be handy for archiving the generated documentation or 
 # if some version control system is used.
 
-PROJECT_NUMBER         = 3.3.0
+PROJECT_NUMBER         = 4.0.0
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) 
 # base path where the generated documentation will be put. 
diff --git a/rubberband/RubberBandLiveShifter.h b/rubberband/RubberBandLiveShifter.h
index 8081195..e809666 100644
--- a/rubberband/RubberBandLiveShifter.h
+++ b/rubberband/RubberBandLiveShifter.h
@@ -51,9 +51,10 @@ namespace RubberBand
  * Band Library designed for applications that need to perform
  * pitch-shifting only, without time-stretching, and to do so in a
  * straightforward block-by-block process with the shortest available
- * processing delay.
+ * processing delay. For the more general interface, see
+ * RubberBand::RubberBandStretcher.
  *
- * RubberBandLiveShifter has a much simpler API than the general
+ * RubberBandLiveShifter has a much simpler API than
  * RubberBandStretcher. Its process function, called
  * RubberBandLiveShifter::shift(), accepts a fixed number of sample
  * frames on each call and always returns exactly the same number of
@@ -61,12 +62,12 @@ namespace RubberBand
  * process/available/retrieve call sequence that RubberBandStretcher
  * requires as a result of its variable output rate.
  *
- * The number of frames RubberBandLiveShifter::shift() accepts and
- * returns is not under the caller's control: it always requires
- * exactly the number given by RubberBandLiveShifter::getBlockSize().
- * However, that number is fixed for the lifetime of the shifter, so
- * it only needs to be queried once and then fixed-size buffers may be
- * passed.
+ * The number of frames accepted by and returned from
+ * RubberBandLiveShifter::shift() are not under the caller's control:
+ * they must always be exactly the number given by
+ * RubberBandLiveShifter::getBlockSize(). But this number is fixed for
+ * the lifetime of the shifter, so it only needs to be queried once
+ * after construction and then fixed-size buffers may be used.
  *
  * Using RubberBandLiveShifter also gives a shorter processing delay
  * than a typical buffering setup using RubberBandStretcher, making it
diff --git a/rubberband/RubberBandStretcher.h b/rubberband/RubberBandStretcher.h
index 295677c..b938ea9 100644
--- a/rubberband/RubberBandStretcher.h
+++ b/rubberband/RubberBandStretcher.h
@@ -56,13 +56,13 @@ namespace RubberBand
  * The primary Rubber Band Library API is contained in the class
  * RubberBand::RubberBandStretcher. This class can perform both pitch
  * shifting and time stretching and supports every feature of the
- * library. A simpler, more limited alternative API that supports only
+ * library. A simpler, more limited API that supports only
  * pitch-shifting can be found in RubberBand::RubberBandLiveShifter.
  *
  * RubberBandStretcher supports two processing modes, offline and
  * real-time, and two processing "engines", known as the R2 or Faster
  * engine and the R3 or Finer engine. The choices of processing mode
- * and engine are fixed on construction: see
+ * and engine are fixed on construction: see the constructor
  * RubberBandStretcher::RubberBandStretcher. The two engines work
  * identically in API terms, and both of them support both offline and
  * real-time modes as described below.