diff --git a/src/Symfony/Component/Console/Command/DumpCompletionCommand.php b/src/Symfony/Component/Console/Command/DumpCompletionCommand.php
index 7597a9e2cc651..0b059f3eddcdf 100644
--- a/src/Symfony/Component/Console/Command/DumpCompletionCommand.php
+++ b/src/Symfony/Component/Console/Command/DumpCompletionCommand.php
@@ -45,34 +45,40 @@ protected function configure()
         $commandName = basename($fullCommand);
         $fullCommand = realpath($fullCommand) ?: $fullCommand;
 
+        $shell = $this->guessShell();
+        [$rcFile, $completionFile] = match ($shell) {
+            'fish' => ['~/.config/fish/config.fish', "/etc/fish/completions/$commandName.fish"],
+            default => ['~/.bashrc', "/etc/bash_completion.d/$commandName"],
+        };
+
         $this
             ->setHelp(<<<EOH
 The <info>%command.name%</> command dumps the shell completion script required
-to use shell autocompletion (currently only bash completion is supported).
+to use shell autocompletion (currently, bash and fish completion is supported).
 
 <comment>Static installation
 -------------------</>
 
 Dump the script to a global completion file and restart your shell:
 
-    <info>%command.full_name% bash | sudo tee /etc/bash_completion.d/${commandName}</>
+    <info>%command.full_name% {$shell} | sudo tee {$completionFile}</>
 
 Or dump the script to a local file and source it:
 
-    <info>%command.full_name% bash > completion.sh</>
+    <info>%command.full_name% {$shell} > completion.sh</>
 
     <comment># source the file whenever you use the project</>
     <info>source completion.sh</>
 
-    <comment># or add this line at the end of your "~/.bashrc" file:</>
+    <comment># or add this line at the end of your "{$rcFile}" file:</>
     <info>source /path/to/completion.sh</>
 
 <comment>Dynamic installation
 --------------------</>
 
-Add this to the end of your shell configuration file (e.g. <info>"~/.bashrc"</>):
+Add this to the end of your shell configuration file (e.g. <info>"{$rcFile}"</>):
 
-    <info>eval "$(${fullCommand} completion bash)"</>
+    <info>eval "$({$fullCommand} completion {$shell})"</>
 EOH
             )
             ->addArgument('shell', InputArgument::OPTIONAL, 'The shell type (e.g. "bash"), the value of the "$SHELL" env var will be used if this is not given', null, $this->getSupportedShells(...))
diff --git a/src/Symfony/Component/Console/Resources/completion.fish b/src/Symfony/Component/Console/Resources/completion.fish
index 6566c58a3f9ea..680d180e03843 100644
--- a/src/Symfony/Component/Console/Resources/completion.fish
+++ b/src/Symfony/Component/Console/Resources/completion.fish
@@ -7,7 +7,7 @@
 
 function _sf_{{ COMMAND_NAME }}
     set sf_cmd (commandline -o)
-    set c (math (count (commandline -oc))) - 1)
+    set c (count (commandline -oc))
 
     set completecmd "$sf_cmd[1]" "_complete" "-sfish" "-S{{ VERSION }}"
 
diff --git a/src/Symfony/Component/Console/Tests/Descriptor/AbstractDescriptorTest.php b/src/Symfony/Component/Console/Tests/Descriptor/AbstractDescriptorTest.php
index 97199fb34573e..2095266965ef7 100644
--- a/src/Symfony/Component/Console/Tests/Descriptor/AbstractDescriptorTest.php
+++ b/src/Symfony/Component/Console/Tests/Descriptor/AbstractDescriptorTest.php
@@ -48,6 +48,9 @@ public function testDescribeCommand(Command $command, $expectedDescription)
     /** @dataProvider getDescribeApplicationTestData */
     public function testDescribeApplication(Application $application, $expectedDescription)
     {
+        // the "completion" command has dynamic help information depending on the shell
+        $application->find('completion')->setHelp('');
+
         $this->assertDescription($expectedDescription, $application);
     }
 
diff --git a/src/Symfony/Component/Console/Tests/Fixtures/application_1.json b/src/Symfony/Component/Console/Tests/Fixtures/application_1.json
index c4e98a957ba0d..db3c250fff003 100644
--- a/src/Symfony/Component/Console/Tests/Fixtures/application_1.json
+++ b/src/Symfony/Component/Console/Tests/Fixtures/application_1.json
@@ -120,7 +120,7 @@
                 "completion [--debug] [--] [<shell>]"
             ],
             "description": "Dump the shell completion script",
-            "help": "The <info>completion</> command dumps the shell completion script required\nto use shell autocompletion (currently only bash completion is supported).\n\n<comment>Static installation\n-------------------</>\n\nDump the script to a global completion file and restart your shell:\n\n    <info>%%PHP_SELF%% completion bash | sudo tee /etc/bash_completion.d/%%COMMAND_NAME%%</>\n\nOr dump the script to a local file and source it:\n\n    <info>%%PHP_SELF%% completion bash > completion.sh</>\n\n    <comment># source the file whenever you use the project</>\n    <info>source completion.sh</>\n\n    <comment># or add this line at the end of your \"~/.bashrc\" file:</>\n    <info>source /path/to/completion.sh</>\n\n<comment>Dynamic installation\n--------------------</>\n\nAdd this to the end of your shell configuration file (e.g. <info>\"~/.bashrc\"</>):\n\n    <info>eval \"$(%%PHP_SELF_FULL%% completion bash)\"</>",
+            "help": "Dump the shell completion script",
             "definition": {
                 "arguments": {
                     "shell": {
diff --git a/src/Symfony/Component/Console/Tests/Fixtures/application_1.md b/src/Symfony/Component/Console/Tests/Fixtures/application_1.md
index 0bef4ce3148e0..bb722c07704b5 100644
--- a/src/Symfony/Component/Console/Tests/Fixtures/application_1.md
+++ b/src/Symfony/Component/Console/Tests/Fixtures/application_1.md
@@ -14,32 +14,7 @@ Dump the shell completion script
 
 * `completion [--debug] [--] [<shell>]`
 
-The completion command dumps the shell completion script required
-to use shell autocompletion (currently only bash completion is supported).
-
-Static installation
--------------------
-
-Dump the script to a global completion file and restart your shell:
-
-    %%PHP_SELF%% completion bash | sudo tee /etc/bash_completion.d/%%COMMAND_NAME%%
-
-Or dump the script to a local file and source it:
-
-    %%PHP_SELF%% completion bash > completion.sh
-
-    # source the file whenever you use the project
-    source completion.sh
-
-    # or add this line at the end of your "~/.bashrc" file:
-    source /path/to/completion.sh
-
-Dynamic installation
---------------------
-
-Add this to the end of your shell configuration file (e.g. "~/.bashrc"):
-
-    eval "$(%%PHP_SELF_FULL%% completion bash)"
+Dump the shell completion script
 
 ### Arguments
 
diff --git a/src/Symfony/Component/Console/Tests/Fixtures/application_1.xml b/src/Symfony/Component/Console/Tests/Fixtures/application_1.xml
index d56164ef875f5..9010a68a17a36 100644
--- a/src/Symfony/Component/Console/Tests/Fixtures/application_1.xml
+++ b/src/Symfony/Component/Console/Tests/Fixtures/application_1.xml
@@ -53,32 +53,7 @@
         <usage>completion [--debug] [--] [&lt;shell&gt;]</usage>
       </usages>
       <description>Dump the shell completion script</description>
-      <help>The &lt;info&gt;completion&lt;/&gt; command dumps the shell completion script required
- to use shell autocompletion (currently only bash completion is supported).
- 
- &lt;comment&gt;Static installation
- -------------------&lt;/&gt;
- 
- Dump the script to a global completion file and restart your shell:
- 
-     &lt;info&gt;%%PHP_SELF%% completion bash | sudo tee /etc/bash_completion.d/%%COMMAND_NAME%%&lt;/&gt;
- 
- Or dump the script to a local file and source it:
- 
-     &lt;info&gt;%%PHP_SELF%% completion bash &gt; completion.sh&lt;/&gt;
- 
-     &lt;comment&gt;# source the file whenever you use the project&lt;/&gt;
-     &lt;info&gt;source completion.sh&lt;/&gt;
- 
-     &lt;comment&gt;# or add this line at the end of your "~/.bashrc" file:&lt;/&gt;
-     &lt;info&gt;source /path/to/completion.sh&lt;/&gt;
- 
- &lt;comment&gt;Dynamic installation
- --------------------&lt;/&gt;
- 
- Add this to the end of your shell configuration file (e.g. &lt;info&gt;"~/.bashrc"&lt;/&gt;):
- 
-     &lt;info&gt;eval "$(%%PHP_SELF_FULL%% completion bash)"&lt;/&gt;</help>
+      <help>Dump the shell completion script</help>
       <arguments>
         <argument name="shell" is_required="0" is_array="0">
           <description>The shell type (e.g. "bash"), the value of the "$SHELL" env var will be used if this is not given</description>
diff --git a/src/Symfony/Component/Console/Tests/Fixtures/application_2.json b/src/Symfony/Component/Console/Tests/Fixtures/application_2.json
index 7cd6deddcec4d..0938b3ed3c535 100644
--- a/src/Symfony/Component/Console/Tests/Fixtures/application_2.json
+++ b/src/Symfony/Component/Console/Tests/Fixtures/application_2.json
@@ -124,7 +124,7 @@
                 "completion [--debug] [--] [<shell>]"
             ],
             "description": "Dump the shell completion script",
-            "help": "The <info>completion</> command dumps the shell completion script required\nto use shell autocompletion (currently only bash completion is supported).\n\n<comment>Static installation\n-------------------</>\n\nDump the script to a global completion file and restart your shell:\n\n    <info>%%PHP_SELF%% completion bash | sudo tee /etc/bash_completion.d/%%COMMAND_NAME%%</>\n\nOr dump the script to a local file and source it:\n\n    <info>%%PHP_SELF%% completion bash > completion.sh</>\n\n    <comment># source the file whenever you use the project</>\n    <info>source completion.sh</>\n\n    <comment># or add this line at the end of your \"~/.bashrc\" file:</>\n    <info>source /path/to/completion.sh</>\n\n<comment>Dynamic installation\n--------------------</>\n\nAdd this to the end of your shell configuration file (e.g. <info>\"~/.bashrc\"</>):\n\n    <info>eval \"$(%%PHP_SELF_FULL%% completion bash)\"</>",
+            "help": "Dump the shell completion script",
             "definition": {
                 "arguments": {
                     "shell": {
diff --git a/src/Symfony/Component/Console/Tests/Fixtures/application_2.md b/src/Symfony/Component/Console/Tests/Fixtures/application_2.md
index 2fa9a220836fb..d4802c7470937 100644
--- a/src/Symfony/Component/Console/Tests/Fixtures/application_2.md
+++ b/src/Symfony/Component/Console/Tests/Fixtures/application_2.md
@@ -27,32 +27,7 @@ Dump the shell completion script
 
 * `completion [--debug] [--] [<shell>]`
 
-The completion command dumps the shell completion script required
-to use shell autocompletion (currently only bash completion is supported).
-
-Static installation
--------------------
-
-Dump the script to a global completion file and restart your shell:
-
-    %%PHP_SELF%% completion bash | sudo tee /etc/bash_completion.d/%%COMMAND_NAME%%
-
-Or dump the script to a local file and source it:
-
-    %%PHP_SELF%% completion bash > completion.sh
-
-    # source the file whenever you use the project
-    source completion.sh
-
-    # or add this line at the end of your "~/.bashrc" file:
-    source /path/to/completion.sh
-
-Dynamic installation
---------------------
-
-Add this to the end of your shell configuration file (e.g. "~/.bashrc"):
-
-    eval "$(%%PHP_SELF_FULL%% completion bash)"
+Dump the shell completion script
 
 ### Arguments
 
diff --git a/src/Symfony/Component/Console/Tests/Fixtures/application_2.xml b/src/Symfony/Component/Console/Tests/Fixtures/application_2.xml
index 801390ef5bd54..075aacc7b5399 100644
--- a/src/Symfony/Component/Console/Tests/Fixtures/application_2.xml
+++ b/src/Symfony/Component/Console/Tests/Fixtures/application_2.xml
@@ -53,32 +53,7 @@
         <usage>completion [--debug] [--] [&lt;shell&gt;]</usage>
       </usages>
       <description>Dump the shell completion script</description>
-      <help>The &lt;info&gt;completion&lt;/&gt; command dumps the shell completion script required
- to use shell autocompletion (currently only bash completion is supported).
- 
- &lt;comment&gt;Static installation
- -------------------&lt;/&gt;
- 
- Dump the script to a global completion file and restart your shell:
- 
-     &lt;info&gt;%%PHP_SELF%% completion bash | sudo tee /etc/bash_completion.d/%%COMMAND_NAME%%&lt;/&gt;
- 
- Or dump the script to a local file and source it:
- 
-     &lt;info&gt;%%PHP_SELF%% completion bash &gt; completion.sh&lt;/&gt;
- 
-     &lt;comment&gt;# source the file whenever you use the project&lt;/&gt;
-     &lt;info&gt;source completion.sh&lt;/&gt;
- 
-     &lt;comment&gt;# or add this line at the end of your "~/.bashrc" file:&lt;/&gt;
-     &lt;info&gt;source /path/to/completion.sh&lt;/&gt;
- 
- &lt;comment&gt;Dynamic installation
- --------------------&lt;/&gt;
- 
- Add this to the end of your shell configuration file (e.g. &lt;info&gt;"~/.bashrc"&lt;/&gt;):
- 
-     &lt;info&gt;eval "$(%%PHP_SELF_FULL%% completion bash)"&lt;/&gt;</help>
+      <help>Dump the shell completion script</help>
       <arguments>
         <argument name="shell" is_required="0" is_array="0">
           <description>The shell type (e.g. "bash"), the value of the "$SHELL" env var will be used if this is not given</description>
diff --git a/src/Symfony/Component/Console/Tests/Fixtures/application_mbstring.md b/src/Symfony/Component/Console/Tests/Fixtures/application_mbstring.md
index 740ea5c202050..e7bc69c71019d 100644
--- a/src/Symfony/Component/Console/Tests/Fixtures/application_mbstring.md
+++ b/src/Symfony/Component/Console/Tests/Fixtures/application_mbstring.md
@@ -18,32 +18,7 @@ Dump the shell completion script
 
 * `completion [--debug] [--] [<shell>]`
 
-The completion command dumps the shell completion script required
-to use shell autocompletion (currently only bash completion is supported).
-
-Static installation
--------------------
-
-Dump the script to a global completion file and restart your shell:
-
-    %%PHP_SELF%% completion bash | sudo tee /etc/bash_completion.d/%%COMMAND_NAME%%
-
-Or dump the script to a local file and source it:
-
-    %%PHP_SELF%% completion bash > completion.sh
-
-    # source the file whenever you use the project
-    source completion.sh
-
-    # or add this line at the end of your "~/.bashrc" file:
-    source /path/to/completion.sh
-
-Dynamic installation
---------------------
-
-Add this to the end of your shell configuration file (e.g. "~/.bashrc"):
-
-    eval "$(%%PHP_SELF_FULL%% completion bash)"
+Dump the shell completion script
 
 ### Arguments
 

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