diff --git a/Config.cpp b/Config.cpp
index d1bf7b64..00350608 100644
--- a/Config.cpp
+++ b/Config.cpp
@@ -223,6 +223,15 @@ namespace config {
 
   void Finalize() {
     notify(m_Options);
-  };
+  }
+
+  bool IsDefault(const char *name) {
+    if (!m_Options.count(name))
+      throw "try to check non-existent option";
+
+    if (m_Options[name].defaulted())
+      return true;
+    return false;
+  }
 } // namespace config
 } // namespace i2p
diff --git a/Config.h b/Config.h
index 51a12d70..07d7ccb7 100644
--- a/Config.h
+++ b/Config.h
@@ -94,6 +94,13 @@ namespace config {
     notify(m_Options);
     return true;
   }
+
+  /**
+   * @brief  Check is value explicitly given or default
+   * @param  name  Name of checked parameter
+   * @return true if value set to default, false othervise
+   */
+  bool IsDefault(const char *name);
 }
 }