diff --git a/Build.html b/Build.html
index 7baef793..13834dee 100644
--- a/Build.html
+++ b/Build.html
@@ -266,7 +266,6 @@ publishing to the NuGet gallery is quite unreliable.</p>
 <li>Create new GitHub release, attach Zip files (to be automated)</li>
 <li><p>Copy artifacts to <a href="https://1drv.ms/1lMtdNi">release archive</a> (to be automated)</p></li>
 <li><p>Consider a tweet via <a href="https://twitter.com/MathDotNet">@MathDotNet</a></p></li>
-<li><p>Consider a post to the <a href="https://plus.google.com/112484567926928665204">Google+ site</a></p></li>
 <li>
 <p>Update Wikipedia release version and date for the
 <a href="https://en.wikipedia.org/wiki/Math.NET_Numerics">Math.NET Numerics</a> and
diff --git a/Functions.html b/Functions.html
index 3efe545d..30bb992f 100644
--- a/Functions.html
+++ b/Functions.html
@@ -151,7 +151,7 @@
 <ul>
 <li><code>BetaLn(a,b)</code></li>
 </ul>
-<p><span class="math">\[\ln\mathrm{B}(a,b) = \Gamma(a) + \Gamma(b) - \Gamma(a+b)\]</span></p>
+<p><span class="math">\[\ln\mathrm{B}(a,b) = \ln\Gamma(a) + \ln\Gamma(b) - \ln\Gamma(a+b)\]</span></p>
 <h4><a name="Incomplete-Beta" class="anchor" href="#Incomplete-Beta">Incomplete Beta</a></h4>
 <ul>
 <li><code>BetaIncomplete(a,b,x)</code></li>
diff --git a/ReleaseNotes.html b/ReleaseNotes.html
index b60f1257..3c7e8d26 100644
--- a/ReleaseNotes.html
+++ b/ReleaseNotes.html
@@ -59,6 +59,14 @@
                     
 <h1><a name="Math-NET-Numerics-Release-Notes" class="anchor" href="#Math-NET-Numerics-Release-Notes">Math.NET Numerics Release Notes</a></h1>
 <p><a href="ReleaseNotes.html">Math.NET Numerics</a> | <a href="ReleaseNotes-MKL.html">MKL Provider</a> | <a href="ReleaseNotes-OpenBLAS.html">OpenBLAS Provider</a> | <a href="ReleaseNotes-Data.html">Data Extensions</a></p>
+<h3><a name="4-9-1-2020-04-12" class="anchor" href="#4-9-1-2020-04-12">4.9.1 - 2020-04-12</a></h3>
+<ul>
+<li>BUG: Optimization: weights were applied wrongly when evaluating the Jacobian <em>~Jong Hyun Kim, zhaochenxi</em></li>
+<li>BUG: Linear Algebra: F# Matrix.reduceRows was reducing columns instead of rows <em>~kayanme</em></li>
+<li>BUG: Distributions: Hypergeometric.CDF no longer returns values &gt; 1.0 <em>~Manor Askenazi</em></li>
+<li>Documentation: fix missing logarithms, drop old links "~Michel de Ruiter, Guney Ozsan*</li>
+<li>Build: no longer code-sign the assemblies with a code-signing certificate, since it is too painful.</li>
+</ul>
 <h3><a name="4-9-0-2019-10-13" class="anchor" href="#4-9-0-2019-10-13">4.9.0 - 2019-10-13</a></h3>
 <ul>
 <li>Integration: Substitution for open intervals <em>~Jong Hyun Kim</em></li>