diff --git a/README.rst b/README.rst
index beb4d6b6..e419c3c3 100644
--- a/README.rst
+++ b/README.rst
@@ -258,23 +258,22 @@ Displays contents in the command console after the package has been installed.
 Avoid outputting meaningless information and use it only when you need to show
 help messages or the next step actions.
 
-The contents are defined as a simple array of strings (Symfony Flex adds a
-``PHP_EOL`` character after each line). `Symfony Console styles and colors`_
-are supported too:
+The contents must be defined in a file named ``post-install.txt`` (Symfony Flex
+adds a ``PHP_EOL`` character after each line). `Symfony Console styles and
+colors`_ are supported too:
 
-.. code-block:: json
+.. code-block:: text
 
-    {
-        "post-install-output": [
-            "<fg=blue> What's next? </>",
-            "",
-            "  * <fg=blue>Run</> your application:",
-            "    1. Execute the <comment>make serve</comment> command;",
-            "    2. Browse to the <comment>http://localhost:8000/</comment> URL.",
-            "",
-            "  * <fg=blue>Read</> the documentation at <comment>https://symfony.com/doc</comment>"
-        ]
-    }
+    <bg=blue;fg=white>              </>
+    <bg=blue;fg=white> What's next? </>
+    <bg=blue;fg=white>              </>
+
+      * <fg=blue>Run</> your application:
+        1. Change to the project directory
+        2. Execute the <comment>make serve</> command;
+        3. Browse to the <comment>http://localhost:8000/</> URL.
+
+      * <fg=blue>Read</> the documentation at <comment>https://symfony.com/doc</>
 
 Full Example
 ------------
@@ -302,38 +301,11 @@ one used by ``symfony/framework-bundle``:
             "APP_DEBUG": "1",
             "APP_SECRET": "Ju$tChang3it!"
         },
-        "makefile": [
-            "cache-clear:",
-            "\t@test -f bin/console && bin/console cache:clear --no-warmup || rm -rf var/cache/*",
-            ".PHONY: cache-clear",
-            "",
-            "cache-warmup: cache-clear",
-            "\t@test -f bin/console && bin/console cache:warmup || echo \"cannot warmup the cache (needs symfony/console)\"",
-            ".PHONY: cache-warmup",
-            "",
-            "serve:",
-            "\t@echo \"\\033[32;49mServer listening on http://127.0.0.1:8000\\033[39m\"",
-            "\t@echo \"Quit the server with CTRL-C.\"",
-            "\t@echo \"Run \\033[32mcomposer require symfony/web-server-bundle\\033[39m for a better web server\"",
-            "\tphp -S 127.0.0.1:8000 -t web",
-            ".PHONY: serve"
-        ],
         "gitignore": [
             ".env",
             "/var/",
             "/vendor/",
             "/web/bundles/"
-        ],
-        "post-install-output": [
-            "<bg=blue;fg=white>              </>",
-            "<bg=blue;fg=white> What's next? </>",
-            "<bg=blue;fg=white>              </>",
-            "",
-            "  * <fg=blue>Run</> your application:",
-            "    1. Execute the <comment>make serve</comment> command;",
-            "    2. Browse to the <comment>http://localhost:8000/</comment> URL.",
-            "",
-            "  * <fg=blue>Read</> the documentation at <comment>https://symfony.com/doc</comment>"
         ]
     }
 
diff --git a/symfony/framework-bundle/3.3/manifest.json b/symfony/framework-bundle/3.3/manifest.json
index 77983ed3..98e6ad18 100644
--- a/symfony/framework-bundle/3.3/manifest.json
+++ b/symfony/framework-bundle/3.3/manifest.json
@@ -21,17 +21,5 @@
         "/var/",
         "/vendor/",
         "/web/bundles/"
-    ],
-    "post-install-output": [
-        "<bg=blue;fg=white>              </>",
-        "<bg=blue;fg=white> What's next? </>",
-        "<bg=blue;fg=white>              </>",
-        "",
-        "  * <fg=blue>Run</> your application:",
-        "    1. Change to the project directory",
-        "    2. Execute the <comment>make serve</comment> command;",
-        "    3. Browse to the <comment>http://localhost:8000/</comment> URL.",
-        "",
-        "  * <fg=blue>Read</> the documentation at <comment>https://symfony.com/doc</comment>"
     ]
 }
diff --git a/symfony/framework-bundle/3.3/post-install.txt b/symfony/framework-bundle/3.3/post-install.txt
new file mode 100644
index 00000000..f46cdb29
--- /dev/null
+++ b/symfony/framework-bundle/3.3/post-install.txt
@@ -0,0 +1,10 @@
+<bg=blue;fg=white>              </>
+<bg=blue;fg=white> What's next? </>
+<bg=blue;fg=white>              </>
+
+  * <fg=blue>Run</> your application:
+    1. Change to the project directory
+    2. Execute the <comment>make serve</> command;
+    3. Browse to the <comment>http://localhost:8000/</> URL.
+
+  * <fg=blue>Read</> the documentation at <comment>https://symfony.com/doc</>