diff --git a/Processor.php b/Processor.php
index 6dc208f..7e5c054 100644
--- a/Processor.php
+++ b/Processor.php
@@ -104,7 +104,7 @@ private function processParams(array $config, array $expectedParams, array $actu
         // Add the params coming from the environment values
         $actualParams = array_replace($actualParams, $this->getEnvValues($envMap));
 
-        return $this->getParams($expectedParams, $actualParams);
+        return $this->getParams($expectedParams, $actualParams, $config);
     }
 
     private function getEnvValues(array $envMap)
@@ -137,7 +137,7 @@ private function processRenamedValues(array $renameMap, array $actualParams)
         return $actualParams;
     }
 
-    private function getParams(array $expectedParams, array $actualParams)
+    private function getParams(array $expectedParams, array $actualParams, array $config = array())
     {
         // Simply use the expectedParams value as default for the missing params.
         if (!$this->io->isInteractive()) {
@@ -153,7 +153,11 @@ private function getParams(array $expectedParams, array $actualParams)
 
             if (!$isStarted) {
                 $isStarted = true;
-                $this->io->write('<comment>Some parameters are missing. Please provide them.</comment>');
+                if (empty($config['comment'])) {
+                    $this->io->write('<comment>Some parameters are missing. Please provide them.</comment>');
+                } else {
+                    $this->io->write(sprintf('<comment>%s</comment>', $config['comment']));
+                }
             }
 
             $default = Inline::dump($message);
diff --git a/Tests/ProcessorTest.php b/Tests/ProcessorTest.php
index babf44a..f3b36a7 100644
--- a/Tests/ProcessorTest.php
+++ b/Tests/ProcessorTest.php
@@ -151,7 +151,11 @@ private function setInteractionExpectations(array $testCase)
         }
 
         if (!empty($testCase['requested_params'])) {
-            $this->io->write('<comment>Some parameters are missing. Please provide them.</comment>')->shouldBeCalledTimes(1);
+            if (empty($testCase['config']['comment'])) {
+                $this->io->write('<comment>Some parameters are missing. Please provide them.</comment>')->shouldBeCalledTimes(1);
+            } else {
+                $this->io->write(sprintf('<comment>%s</comment>', $testCase['config']['comment']))->shouldBeCalledTimes(1);
+            }
         }
 
         foreach ($testCase['requested_params'] as $param => $settings) {
diff --git a/Tests/fixtures/testcases/interaction_existent_with_comment/dist.yml b/Tests/fixtures/testcases/interaction_existent_with_comment/dist.yml
new file mode 100644
index 0000000..4134d19
--- /dev/null
+++ b/Tests/fixtures/testcases/interaction_existent_with_comment/dist.yml
@@ -0,0 +1,4 @@
+parameters:
+    foo: bar
+    boolean: false
+    another: ~
diff --git a/Tests/fixtures/testcases/interaction_existent_with_comment/existing.yml b/Tests/fixtures/testcases/interaction_existent_with_comment/existing.yml
new file mode 100644
index 0000000..c31530c
--- /dev/null
+++ b/Tests/fixtures/testcases/interaction_existent_with_comment/existing.yml
@@ -0,0 +1,3 @@
+# This file is auto-generated during the composer install
+parameters:
+    foo: existing_foo
diff --git a/Tests/fixtures/testcases/interaction_existent_with_comment/expected.yml b/Tests/fixtures/testcases/interaction_existent_with_comment/expected.yml
new file mode 100644
index 0000000..73f278e
--- /dev/null
+++ b/Tests/fixtures/testcases/interaction_existent_with_comment/expected.yml
@@ -0,0 +1,5 @@
+# This file is auto-generated during the composer install
+parameters:
+    foo: existing_foo
+    boolean: false
+    another: 'null'
diff --git a/Tests/fixtures/testcases/interaction_existent_with_comment/setup.yml b/Tests/fixtures/testcases/interaction_existent_with_comment/setup.yml
new file mode 100644
index 0000000..3884911
--- /dev/null
+++ b/Tests/fixtures/testcases/interaction_existent_with_comment/setup.yml
@@ -0,0 +1,14 @@
+title: Existing values are not asked interactively again
+
+interactive: true
+
+config:
+  comment: 'Please provide your configuration parameters'
+
+requested_params:
+    boolean:
+        default: 'false'
+        input: 'false'
+    another:
+        default: 'null'
+        input: '"null"'
diff --git a/Tests/fixtures/testcases/interaction_non_existent_with_comment/dist.yml b/Tests/fixtures/testcases/interaction_non_existent_with_comment/dist.yml
new file mode 100644
index 0000000..c6e5b2c
--- /dev/null
+++ b/Tests/fixtures/testcases/interaction_non_existent_with_comment/dist.yml
@@ -0,0 +1,4 @@
+parameters:
+    boolean: false
+    another: test
+    nested: nested
diff --git a/Tests/fixtures/testcases/interaction_non_existent_with_comment/expected.yml b/Tests/fixtures/testcases/interaction_non_existent_with_comment/expected.yml
new file mode 100644
index 0000000..84b8ddd
--- /dev/null
+++ b/Tests/fixtures/testcases/interaction_non_existent_with_comment/expected.yml
@@ -0,0 +1,10 @@
+# This file is auto-generated during the composer install
+parameters:
+    boolean: true
+    another: null
+    nested:
+        foo: bar
+        bar:
+            - foo
+            - test
+            - null
diff --git a/Tests/fixtures/testcases/interaction_non_existent_with_comment/setup.yml b/Tests/fixtures/testcases/interaction_non_existent_with_comment/setup.yml
new file mode 100644
index 0000000..28b0ac0
--- /dev/null
+++ b/Tests/fixtures/testcases/interaction_non_existent_with_comment/setup.yml
@@ -0,0 +1,17 @@
+title: Missing keys are asked interactively
+
+interactive: true
+
+config:
+  comment: 'Please provide your configuration parameters'
+
+requested_params:
+    boolean:
+        default: 'false'
+        input: 'true'
+    nested:
+        default: nested
+        input: '{foo: bar, bar: [foo, test, null]}'
+    another:
+        default: test
+        input: 'null'