diff --git a/doc/br/manual.html b/doc/br/manual.html
index ddb4d1b..1995734 100644
--- a/doc/br/manual.html
+++ b/doc/br/manual.html
@@ -340,13 +340,20 @@ o driver Postgres oferece as seguintes funcionalidades adicionais:</p>
 o driver MySQL ainda oferece as seguintes funcionalidades adicionais:</p>
 
 <dl class="reference">
-    <dt><strong><code>env:connect(sourcename[,username[,password[,hostname[,port]]]])</code></strong></dt>
+    <dt><strong><code>env:connect(sourcename[,username[,password[,hostname[,port[,socket[,client_flag]]]]]])</code></strong></dt>
     <dd>No driver MySQL, esse m&eacute;todo tem mais dois par&acirc;metros opcionais que indicam o
         <code>hostname</code> e a <code>port</code> a serem utilizados na conex&atilde;o.
+        Ela também aceita dois outros parâmetros que indicam um Unix socket de onde abrir a conexão e um flag do cliente.<br/>
         Veja tamb&eacute;m: <a href="#environment_object">ambiente</a><br/>
         Retorna: uma <a href="#connection_object">conex&atilde;o</a>
     </dd>
 
+    <dt><strong><code>conn:ping()</code></strong></dt>
+    <dd>Verifica se uma conexão está fechada (retorna false) ou aberta (retorna true).
+        Irá retornar nil seguido de uma mensagem no caso de erro.<br/>
+        Retorna: true, se a conexão estiver aberta, ou false, se estiver fechada.
+    </dd>
+
     <dt><strong><code>cur:numrows()</code></strong></dt>
     <dd>Veja tamb&eacute;m: <a href="#cursor_object">cursores</a><br/>
         Retorna: o n&uacute;mero de registros no resultado da busca.
diff --git a/doc/us/history.html b/doc/us/history.html
index 2adec2b..24b97d2 100644
--- a/doc/us/history.html
+++ b/doc/us/history.html
@@ -44,6 +44,14 @@
 <h2><a name="history"></a>History</h2>
 
 <dl class="history">
+    <dt><strong>LuaSQL 2.4.0</strong> [??/??/2018]</dt>
+    <dd>
+      <ul>
+        <li>Added support in MySQL driver for opening a connection based on a Unix socket (thanks to rafis)</li>
+        <li>Added connection ping method (thanks to rafis)</li>
+      </ul>
+    </dd>
+
     <dt><strong>LuaSQL 2.3.5</strong> [23/Feb/2017]</dt>
     <dd>
       <ul>
diff --git a/doc/us/manual.html b/doc/us/manual.html
index edbc80f..d93c4c9 100644
--- a/doc/us/manual.html
+++ b/doc/us/manual.html
@@ -342,9 +342,11 @@ the Postgres driver also offers these extra features:</p>
 the MySQL driver also offers these extra features:</p>
 
 <dl class="reference">
-  <dt><strong><code>env:connect(sourcename[,username[,password[,hostname[,port]]]])</code></strong></dt>
+  <dt><strong><code>env:connect(sourcename[,username[,password[,hostname[,port[,socket[,client_flag]]]]]])</code></strong></dt>
   <dd>In the MySQL driver, this method adds two optional parameters
-    that indicate the hostname and port to connect.<br/>
+    that indicate the hostname and port to connect.
+    It also accepts two optional parameters that indicate a unix socket and the
+    client flag.<br/>
     See also: <a href="#environment_object">environment objects</a><br/>
     Returns: a <a href="#connection_object">connection object</a></dd>
 
@@ -363,6 +365,13 @@ the MySQL driver also offers these extra features:</p>
     Returns: the number of the last value generated for an AUTO_INCREMENT column.
   </dd>
 
+  <a name="mysql_ping"></a>
+  <dt><strong><code>conn:ping()</code></strong></dt>
+  <dd>Check whether the connection is closed (returns false) or opened (returns true).
+    It will return nil followed by an error message in case of error.<br/>
+    Returns: true, if the connection is opened, or false, if it is closed.
+  </dd>
+
   <dt><strong><code>cur:numrows()</code></strong></dt>
   <dd>See also: <a href="#cursor_object">cursor objects</a><br/>
     Returns: the number of rows in the query result.</dd>