diff --git a/platform/lang-impl/src/com/intellij/ide/actions/searcheverywhere/MultiThreadSearcher.java b/platform/lang-impl/src/com/intellij/ide/actions/searcheverywhere/MultiThreadSearcher.java
index 4b0aa490db46..2baef93940a8 100644
--- a/platform/lang-impl/src/com/intellij/ide/actions/searcheverywhere/MultiThreadSearcher.java
+++ b/platform/lang-impl/src/com/intellij/ide/actions/searcheverywhere/MultiThreadSearcher.java
@@ -112,9 +112,12 @@ class MultiThreadSearcher implements SESearcher {
    * @return {@link ProgressIndicator} that could be used to track and/or cancel searching process
    */
   @Override
-  public ProgressIndicator findMoreItems(Map<SearchEverywhereContributor<?>, Collection<ElementInfo>> alreadyFound, String pattern,
-                                         boolean useNonProjectItems, SearchEverywhereContributor<?> contributorToExpand, int newLimit,
-                                         Function<SearchEverywhereContributor<?>, SearchEverywhereContributorFilter<?>> filterSupplier) {
+  public ProgressIndicator findMoreItems(@NotNull Map<SearchEverywhereContributor<?>, Collection<ElementInfo>> alreadyFound,
+                                         @NotNull String pattern,
+                                         boolean useNonProjectItems,
+                                         @NotNull SearchEverywhereContributor<?> contributorToExpand,
+                                         int newLimit,
+                                         @NotNull Function<SearchEverywhereContributor<?>, SearchEverywhereContributorFilter<?>> filterSupplier) {
     ResultsAccumulator accumulator = new ShowMoreResultsAccumulator(alreadyFound, myEqualityProvider, contributorToExpand, newLimit, myListener, myNotificationExecutor);
     SearchEverywhereContributorFilter<?> filter = filterSupplier.apply(contributorToExpand);
     ProgressIndicator indicator = new ProgressIndicatorBase();
diff --git a/platform/lang-impl/src/com/intellij/ide/actions/searcheverywhere/SESearcher.java b/platform/lang-impl/src/com/intellij/ide/actions/searcheverywhere/SESearcher.java
index f1de0f3c3d9d..3c73eacf4f39 100644
--- a/platform/lang-impl/src/com/intellij/ide/actions/searcheverywhere/SESearcher.java
+++ b/platform/lang-impl/src/com/intellij/ide/actions/searcheverywhere/SESearcher.java
@@ -10,13 +10,17 @@ import java.util.Map;
 import java.util.function.Function;
 
 interface SESearcher {
-  ProgressIndicator search(Map<SearchEverywhereContributor<?>, Integer> contributorsAndLimits, String pattern,
+  ProgressIndicator search(@NotNull Map<SearchEverywhereContributor<?>, Integer> contributorsAndLimits,
+                           @NotNull String pattern,
                            boolean useNonProjectItems,
-                           Function<SearchEverywhereContributor<?>, SearchEverywhereContributorFilter<?>> filterSupplier);
+                           @NotNull Function<SearchEverywhereContributor<?>, SearchEverywhereContributorFilter<?>> filterSupplier);
 
-  ProgressIndicator findMoreItems(Map<SearchEverywhereContributor<?>, Collection<ElementInfo>> alreadyFound, String pattern,
-                                  boolean useNonProjectItems, SearchEverywhereContributor<?> contributorToExpand, int newLimit,
-                                  Function<SearchEverywhereContributor<?>, SearchEverywhereContributorFilter<?>> filterSupplier);
+  ProgressIndicator findMoreItems(@NotNull Map<SearchEverywhereContributor<?>, Collection<ElementInfo>> alreadyFound,
+                                  @NotNull String pattern,
+                                  boolean useNonProjectItems,
+                                  @NotNull SearchEverywhereContributor<?> contributorToExpand,
+                                  int newLimit,
+                                  @NotNull Function<SearchEverywhereContributor<?>, SearchEverywhereContributorFilter<?>> filterSupplier);
 
   /**
    * Search process listener interface
diff --git a/platform/lang-impl/src/com/intellij/ide/actions/searcheverywhere/SingleThreadSearcher.java b/platform/lang-impl/src/com/intellij/ide/actions/searcheverywhere/SingleThreadSearcher.java
index 6a52216036ec..db044ad0bc2e 100644
--- a/platform/lang-impl/src/com/intellij/ide/actions/searcheverywhere/SingleThreadSearcher.java
+++ b/platform/lang-impl/src/com/intellij/ide/actions/searcheverywhere/SingleThreadSearcher.java
@@ -32,8 +32,10 @@ class SingleThreadSearcher implements SESearcher {
   }
 
   @Override
-  public ProgressIndicator search(Map<SearchEverywhereContributor<?>, Integer> contributorsAndLimits, String pattern, boolean useNonProjectItems,
-                                  Function<SearchEverywhereContributor<?>, SearchEverywhereContributorFilter<?>> filterSupplier) {
+  public ProgressIndicator search(@NotNull Map<SearchEverywhereContributor<?>, Integer> contributorsAndLimits,
+                                  @NotNull String pattern,
+                                  boolean useNonProjectItems,
+                                  @NotNull Function<SearchEverywhereContributor<?>, SearchEverywhereContributorFilter<?>> filterSupplier) {
     ProgressIndicator indicator = new ProgressIndicatorBase();
     Runnable task = new SearchTask(contributorsAndLimits, pattern, useNonProjectItems, filterSupplier, indicator, myNotificationExecutor,
                                    myNotificationListener, myEqualityProvider);
@@ -43,9 +45,12 @@ class SingleThreadSearcher implements SESearcher {
   }
 
   @Override
-  public ProgressIndicator findMoreItems(Map<SearchEverywhereContributor<?>, Collection<ElementInfo>> alreadyFound, String pattern,
-                                         boolean useNonProjectItems, SearchEverywhereContributor<?> contributorToExpand, int newLimit,
-                                         Function<SearchEverywhereContributor<?>, SearchEverywhereContributorFilter<?>> filterSupplier) {
+  public ProgressIndicator findMoreItems(@NotNull Map<SearchEverywhereContributor<?>, Collection<ElementInfo>> alreadyFound,
+                                         @NotNull String pattern,
+                                         boolean useNonProjectItems,
+                                         @NotNull SearchEverywhereContributor<?> contributorToExpand,
+                                         int newLimit,
+                                         @NotNull Function<SearchEverywhereContributor<?>, SearchEverywhereContributorFilter<?>> filterSupplier) {
     ProgressIndicator indicator = new ProgressIndicatorBase();
     Runnable task = createShowMoreTask(contributorToExpand, newLimit, pattern, useNonProjectItems, alreadyFound, filterSupplier, indicator);
     ApplicationManager.getApplication().executeOnPooledThread(ConcurrencyUtil.underThreadNameRunnable("SE-SingleThread-SearchTask", task));