diff --git a/concurrency-mapreduce/README.md b/concurrency-mapreduce/README.md
index b1082a3..8fe76ce 100644
--- a/concurrency-mapreduce/README.md
+++ b/concurrency-mapreduce/README.md
@@ -158,7 +158,7 @@ void Map(char *file_name) {
             MR_Emit(token, "1");
         }
     }
-
+    free(line);
     fclose(fp);
 }