diff --git a/docs/topics/extensions.rst b/docs/topics/extensions.rst
index 847353868..b29e1802f 100644
--- a/docs/topics/extensions.rst
+++ b/docs/topics/extensions.rst
@@ -183,7 +183,7 @@ Telnet console extension
 .. module:: scrapy.extensions.telnet
    :synopsis: Telnet console
 
-.. class:: scrapy.extensions.telnet.TelnetConsole
+.. class:: TelnetConsole
 
 Provides a telnet console for getting into a Python interpreter inside the
 currently running Scrapy process, which can be very useful for debugging.
@@ -200,7 +200,7 @@ Memory usage extension
 .. module:: scrapy.extensions.memusage
    :synopsis: Memory usage extension
 
-.. class:: scrapy.extensions.memusage.MemoryUsage
+.. class:: MemoryUsage
 
 .. note:: This extension does not work in Windows.
 
@@ -229,7 +229,7 @@ Memory debugger extension
 .. module:: scrapy.extensions.memdebug
    :synopsis: Memory debugger extension
 
-.. class:: scrapy.extensions.memdebug.MemoryDebugger
+.. class:: MemoryDebugger
 
 An extension for debugging memory usage. It collects information about:
 
@@ -245,7 +245,7 @@ Close spider extension
 .. module:: scrapy.extensions.closespider
    :synopsis: Close spider extension
 
-.. class:: scrapy.extensions.closespider.CloseSpider
+.. class:: CloseSpider
 
 Closes a spider automatically when some conditions are met, using a specific
 closing reason for each condition.
@@ -316,7 +316,7 @@ StatsMailer extension
 .. module:: scrapy.extensions.statsmailer
    :synopsis: StatsMailer extension
 
-.. class:: scrapy.extensions.statsmailer.StatsMailer
+.. class:: StatsMailer
 
 This simple extension can be used to send a notification e-mail every time a
 domain has finished scraping, including the Scrapy stats collected. The email
@@ -332,7 +332,7 @@ Debugging extensions
 Stack trace dump extension
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-.. class:: scrapy.extensions.debug.StackTraceDump
+.. class:: StackTraceDump
 
 Dumps information about the running process when a `SIGQUIT`_ or `SIGUSR2`_
 signal is received. The information dumped is the following:
@@ -361,7 +361,7 @@ There are at least two ways to send Scrapy the `SIGQUIT`_ signal:
 Debugger extension
 ~~~~~~~~~~~~~~~~~~
 
-.. class:: scrapy.extensions.debug.Debugger
+.. class:: Debugger
 
 Invokes a `Python debugger`_ inside a running Scrapy process when a `SIGUSR2`_
 signal is received. After the debugger is exited, the Scrapy process continues