diff --git a/python/psi-api/src/com/jetbrains/python/psi/PyClass.java b/python/psi-api/src/com/jetbrains/python/psi/PyClass.java
index 06ca602393ae..bc89a0de1ef7 100644
--- a/python/psi-api/src/com/jetbrains/python/psi/PyClass.java
+++ b/python/psi-api/src/com/jetbrains/python/psi/PyClass.java
@@ -222,10 +222,10 @@ public interface PyClass extends PsiNameIdentifierOwner, PyStatement, NameDefine
 
   /**
    * Returns the aggregated list of names defined in __slots__ attributes of the class and its ancestors.
-   * @param context
+   * @param context (will be used default if null)
    */
   @Nullable
-  List<String> getSlots(TypeEvalContext context);
+  List<String> getSlots(@Nullable TypeEvalContext context);
 
   /**
    * Returns the list of names in the class' __slots__ attribute, or null if the class