diff --git a/compiler/frontend/src/org/jetbrains/kotlin/kdoc/parser/KDocElementType.java b/compiler/frontend/src/org/jetbrains/kotlin/kdoc/parser/KDocElementType.java
index 70704187ee7..4993d8b2a08 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/kdoc/parser/KDocElementType.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/kdoc/parser/KDocElementType.java
@@ -18,18 +18,19 @@ package org.jetbrains.kotlin.kdoc.parser;
 
 import com.intellij.lang.ASTNode;
 import com.intellij.psi.tree.IElementType;
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.kotlin.idea.JetLanguage;
 import org.jetbrains.kotlin.kdoc.psi.impl.KDocElementImpl;
 
 import java.lang.reflect.Constructor;
 
 public class KDocElementType extends IElementType {
-    private final Constructor<? extends KDocElementImpl> myPsiFactory;
+    private final Constructor<? extends KDocElementImpl> psiFactory;
 
-    public KDocElementType(String debugName, Class<? extends KDocElementImpl> psiClass) {
+    public KDocElementType(String debugName, @NotNull Class<? extends KDocElementImpl> psiClass) {
         super(debugName, JetLanguage.INSTANCE);
         try {
-            myPsiFactory = psiClass != null ? psiClass.getConstructor(ASTNode.class) : null;
+            psiFactory = psiClass != null ? psiClass.getConstructor(ASTNode.class) : null;
         } catch (NoSuchMethodException e) {
             throw new RuntimeException("Must have a constructor with ASTNode");
         }
@@ -39,7 +40,7 @@ public class KDocElementType extends IElementType {
         assert node.getElementType() == this;
 
         try {
-            return myPsiFactory.newInstance(node);
+            return psiFactory.newInstance(node);
         } catch (Exception e) {
             throw new RuntimeException("Error creating psi element for node", e);
         }