diff --git a/src/main/java/io/github/swagger2markup/Swagger2MarkupConfig.java b/src/main/java/io/github/swagger2markup/Swagger2MarkupConfig.java
index a8d64cc3..9757dec7 100644
--- a/src/main/java/io/github/swagger2markup/Swagger2MarkupConfig.java
+++ b/src/main/java/io/github/swagger2markup/Swagger2MarkupConfig.java
@@ -195,5 +195,8 @@ public interface Swagger2MarkupConfig {
      */
     LineSeparator getLineSeparator();
 
+    /**
+     * Returns properties for extensions.
+     */
     Map<String, String> getExtensionsProperties();
 }