diff --git a/src_main/io_devices/piconfig.cpp b/src_main/io_devices/piconfig.cpp
index 4ed67559..258b79cf 100755
--- a/src_main/io_devices/piconfig.cpp
+++ b/src_main/io_devices/piconfig.cpp
@@ -49,6 +49,14 @@
  * debug = true
  * \endcode
  *
+ * You can use multiline values ends with " \\"
+ * \code
+ * value = start \ #s comment
+ *   _mid \
+ *   _end
+ * \endcode
+ * In this example value = "start_mid_end"
+ *
  * \section PIConfig_sec1 Concepts
  * Each node of internal tree has type PIConfig::Entry. %PIConfig
  * has one root element \a rootEntry(). Any entry of configuration file is a