diff --git a/docs/01_Concept_of_the_extractor.md b/docs/01_Concept_of_the_extractor.md
index ed51ded..c311799 100644
--- a/docs/01_Concept_of_the_extractor.md
+++ b/docs/01_Concept_of_the_extractor.md
@@ -44,7 +44,7 @@ class MyExtractor extends FutureExtractor {
     }
 
     @Override
-    public String someDataFiled() 
+    public String someDataField() 
         throws ExtractionException {    //The exception needs to be thrown if something failed
         // get piece of information and return it
     }