diff --git a/.buildinfo b/.buildinfo
index d6269d1..72dac39 100644
--- a/.buildinfo
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@@ -1,4 +1,4 @@
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+config: 31da5909e91e45ad2588f0a17dab0ea3
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diff --git a/_static/documentation_options.js b/_static/documentation_options.js
index 40364a4..c722981 100644
--- a/_static/documentation_options.js
+++ b/_static/documentation_options.js
@@ -1,6 +1,6 @@
 var DOCUMENTATION_OPTIONS = {
     URL_ROOT: document.getElementById("documentation_options").getAttribute('data-url_root'),
-    VERSION: '1.19',
+    VERSION: '1.19.1',
     LANGUAGE: 'en',
     COLLAPSE_INDEX: false,
     BUILDER: 'html',
diff --git a/genindex.html b/genindex.html
index 11291ae..cd45575 100644
--- a/genindex.html
+++ b/genindex.html
@@ -3,7 +3,7 @@
 <head>
   <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Index &mdash; kaldifeat 1.19 documentation</title>
+  <title>Index &mdash; kaldifeat 1.19.1 documentation</title>
       <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
   <!--[if lt IE 9]>
@@ -28,7 +28,7 @@
             <a href="index.html" class="icon icon-home"> kaldifeat
           </a>
               <div class="version">
-                1.19
+                1.19.1
               </div>
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   <form id="rtd-search-form" class="wy-form" action="search.html" method="get">
diff --git a/index.html b/index.html
index 7bf8bae..e672fae 100644
--- a/index.html
+++ b/index.html
@@ -4,7 +4,7 @@
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   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>kaldifeat &mdash; kaldifeat 1.19 documentation</title>
+  <title>kaldifeat &mdash; kaldifeat 1.19.1 documentation</title>
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       <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
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@@ -30,7 +30,7 @@
             <a href="#" class="icon icon-home"> kaldifeat
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-                1.19
+                1.19.1
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diff --git a/installation.html b/installation.html
index c8d1962..53ddc27 100644
--- a/installation.html
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@@ -4,7 +4,7 @@
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   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Installation &mdash; kaldifeat 1.19 documentation</title>
+  <title>Installation &mdash; kaldifeat 1.19.1 documentation</title>
       <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
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@@ -31,7 +31,7 @@
             <a href="index.html" class="icon icon-home"> kaldifeat
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-                1.19
+                1.19.1
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diff --git a/intro.html b/intro.html
index 69668dc..b8e1078 100644
--- a/intro.html
+++ b/intro.html
@@ -4,7 +4,7 @@
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   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Introduction &mdash; kaldifeat 1.19 documentation</title>
+  <title>Introduction &mdash; kaldifeat 1.19.1 documentation</title>
       <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
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@@ -31,7 +31,7 @@
             <a href="index.html" class="icon icon-home"> kaldifeat
           </a>
               <div class="version">
-                1.19
+                1.19.1
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   <form id="rtd-search-form" class="wy-form" action="search.html" method="get">
diff --git a/objects.inv b/objects.inv
index b0f102c..adc8a78 100644
--- a/objects.inv
+++ b/objects.inv
@@ -1,5 +1,5 @@
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diff --git a/search.html b/search.html
index 1f9e359..afc795e 100644
--- a/search.html
+++ b/search.html
@@ -3,7 +3,7 @@
 <head>
   <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Search &mdash; kaldifeat 1.19 documentation</title>
+  <title>Search &mdash; kaldifeat 1.19.1 documentation</title>
       <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
     
@@ -31,7 +31,7 @@
             <a href="index.html" class="icon icon-home"> kaldifeat
           </a>
               <div class="version">
-                1.19
+                1.19.1
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="#" method="get">
diff --git a/usage/fbank.html b/usage/fbank.html
index 2f8c87f..24496f9 100644
--- a/usage/fbank.html
+++ b/usage/fbank.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>kaldifeat.Fbank &mdash; kaldifeat 1.19 documentation</title>
+  <title>kaldifeat.Fbank &mdash; kaldifeat 1.19.1 documentation</title>
       <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
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@@ -31,7 +31,7 @@
             <a href="../index.html" class="icon icon-home"> kaldifeat
           </a>
               <div class="version">
-                1.19
+                1.19.1
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
diff --git a/usage/fbank_options.html b/usage/fbank_options.html
index 1e4fcee..a66e86b 100644
--- a/usage/fbank_options.html
+++ b/usage/fbank_options.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>kaldifeat.FbankOptions &mdash; kaldifeat 1.19 documentation</title>
+  <title>kaldifeat.FbankOptions &mdash; kaldifeat 1.19.1 documentation</title>
       <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
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@@ -31,7 +31,7 @@
             <a href="../index.html" class="icon icon-home"> kaldifeat
           </a>
               <div class="version">
-                1.19
+                1.19.1
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
diff --git a/usage/index.html b/usage/index.html
index 1c8efb8..3e618a6 100644
--- a/usage/index.html
+++ b/usage/index.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Usage &mdash; kaldifeat 1.19 documentation</title>
+  <title>Usage &mdash; kaldifeat 1.19.1 documentation</title>
       <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
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@@ -31,7 +31,7 @@
             <a href="../index.html" class="icon icon-home"> kaldifeat
           </a>
               <div class="version">
-                1.19
+                1.19.1
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
diff --git a/usage/online_fbank.html b/usage/online_fbank.html
index 041c689..31dc995 100644
--- a/usage/online_fbank.html
+++ b/usage/online_fbank.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>kaldifeat.OnlineFbank &mdash; kaldifeat 1.19 documentation</title>
+  <title>kaldifeat.OnlineFbank &mdash; kaldifeat 1.19.1 documentation</title>
       <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
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@@ -30,7 +30,7 @@
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+                1.19.1
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