diff --git a/src/Container/File.php b/src/Container/File.php
index 9569cc7..a63f9f5 100644
--- a/src/Container/File.php
+++ b/src/Container/File.php
@@ -4,6 +4,9 @@
 
 use EM\CssCompiler\Exception\FileException;
 
+/**
+ * @since 0.1
+ */
 class File
 {
     const TYPE_UNKNOWN    = 'unknown';
diff --git a/src/Exception/CompilerException.php b/src/Exception/CompilerException.php
index bd773c8..3e77b83 100644
--- a/src/Exception/CompilerException.php
+++ b/src/Exception/CompilerException.php
@@ -2,6 +2,9 @@
 
 namespace EM\CssCompiler\Exception;
 
+/**
+ * @since 0.1
+ */
 class CompilerException extends \Exception
 {
 }
diff --git a/src/Exception/FileException.php b/src/Exception/FileException.php
index 7773a73..05f5fe0 100644
--- a/src/Exception/FileException.php
+++ b/src/Exception/FileException.php
@@ -2,6 +2,9 @@
 
 namespace EM\CssCompiler\Exception;
 
+/**
+ * @since 0.1
+ */
 class FileException extends \Exception
 {
 }
diff --git a/src/Processor/Processor.php b/src/Processor/Processor.php
index dc949c0..d8b7e56 100644
--- a/src/Processor/Processor.php
+++ b/src/Processor/Processor.php
@@ -9,6 +9,9 @@
 use lessc as LESSCompiler;
 use scss_compass as CompassCompiler;
 
+/**
+ * @since 0.1
+ */
 class Processor
 {
     const FORMATTER_COMPRESSED = 'compressed';