DOC: update release notes

Author: grlee77

doc/release/1.1.0-notes.rst

@@ -17,11 +17,23 @@ Deprecated features
 Backwards incompatible changes
 ==============================
 
+When using complex-valued wavelets with the ``cwt``, the output will now be
+the complex conjugate of the result that was produced by PyWavelets 1.0.x.
+This was done to account for a bug described below. The magnitude of the
+``cwt`` coefficients will still match those from previous releases.
+
 Bugs Fixed
 ==========
-For the complex wavelet transforms, the tests were based on older implementation of Matlab CWT function that had an issue with the phase of the complex wavelet coefficients.
-Consequently, the complex wavelet coefficients were complex conjugates of the proper result.
-The tests were made using cmor1.0-1.0 and compared to the WT implementation proposed by Matlab R2017b and Lancaster University, Physics department Matlab function ``wt.m``.
+
+For a ``cwt`` with complex wavelets, the results in PyWavelets 1.0.x releases
+matched the output of Matlab R2012a's ``cwt``. Howveer, older Matlab releases
+like R2012a had a phase that was of opposite sign to that given in textbook
+definitions of the CWT (Eq. 2 of Torrence and Compo's review article, "A
+Practical Guide to Wavelet Analysis"). Consequently, the wavelet coefficients
+were the complex conjugates of the expected result. This was validated by
+comparing the results of a transform using ``cmor1.0-1.0`` as compared to the
+``cwt`` implementation available in Matlab R2017b as well as to the Lancaster
+University Physics department's Matlab function, ``wt.m``.
 
 Other changes
 =============