diff --git a/src/com/muedsa/intellij/textReader/composes/ReaderWindow.java b/src/com/muedsa/intellij/textReader/composes/ReaderWindow.java
index 38ab52e..be97a0d 100644
--- a/src/com/muedsa/intellij/textReader/composes/ReaderWindow.java
+++ b/src/com/muedsa/intellij/textReader/composes/ReaderWindow.java
@@ -155,7 +155,7 @@ private void createUIComponents(){
 
         searchTextField.getDocument().addDocumentListener(new DocumentAdapter() {
 
-            private List<searchThread> threadList = new ArrayList<>();
+            private final List<searchThread> threadList = new ArrayList<>();
 
             private void search(String searchText){
                 if(StringUtils.isEmpty(searchText)){
@@ -181,7 +181,7 @@ protected void textChanged(@NotNull DocumentEvent documentEvent){
 
             class searchThread extends Thread{
                 private boolean cancel = false;
-                private String searchText;
+                private final String searchText;
 
                 public searchThread(String searchText){
                     super();