diff --git a/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/ConsPStack.java b/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/ConsPStack.java
index 91fef90dc82..a541e1e9206 100644
--- a/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/ConsPStack.java
+++ b/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/ConsPStack.java
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2010-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package kotlin.reflect.jvm.internal.pcollections;
 
 import java.util.Iterator;
@@ -7,8 +23,6 @@ import java.util.NoSuchElementException;
  * A simple persistent stack of non-null values.
  * <p/>
  * This implementation is thread-safe, although its iterators may not be.
- *
- * @author harold
  */
 final class ConsPStack<E> implements Iterable<E> {
     private static final ConsPStack<Object> EMPTY = new ConsPStack<Object>();
diff --git a/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/HashPMap.java b/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/HashPMap.java
index 2989de823e6..eae81f149ea 100644
--- a/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/HashPMap.java
+++ b/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/HashPMap.java
@@ -1,15 +1,23 @@
+/*
+ * Copyright 2010-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package kotlin.reflect.jvm.internal.pcollections;
 
 /**
  * A persistent map from non-null keys to non-null values.
- * <p/>
- * This map uses a given integer map to map hashcodes to lists of elements
- * with the same hashcode. Thus if all elements have the same hashcode, performance
- * is reduced to that of an association list.
- * <p/>
- * This implementation is thread-safe, although its iterators may not be.
- *
- * @author harold
  */
 public final class HashPMap<K, V> {
     private static final HashPMap<Object, Object> EMPTY = new HashPMap<Object, Object>(IntTreePMap.<ConsPStack<MapEntry<Object, Object>>>empty(), 0);
diff --git a/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/IntTree.java b/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/IntTree.java
index 5d3fcd44160..d39167fedc1 100644
--- a/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/IntTree.java
+++ b/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/IntTree.java
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2010-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package kotlin.reflect.jvm.internal.pcollections;
 
 /**
diff --git a/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/IntTreePMap.java b/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/IntTreePMap.java
index 9a77bb2f5b8..040f5464b43 100644
--- a/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/IntTreePMap.java
+++ b/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/IntTreePMap.java
@@ -1,23 +1,23 @@
+/*
+ * Copyright 2010-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package kotlin.reflect.jvm.internal.pcollections;
 
 /**
  * An efficient persistent map from integer keys to non-null values.
- * <p/>
- * Iteration occurs in the integer order of the keys.
- * <p/>
- * This implementation is thread-safe, although its iterators may not be.
- * <p/>
- * The balanced tree is based on the Glasgow Haskell Compiler's Data.Map implementation,
- * which in turn is based on "size balanced binary trees" as described by:
- * <p/>
- * Stephen Adams, "Efficient sets: a balancing act",
- * Journal of Functional Programming 3(4):553-562, October 1993,
- * http://www.swiss.ai.mit.edu/~adams/BB/.
- * <p/>
- * J. Nievergelt and E.M. Reingold, "Binary search trees of bounded balance",
- * SIAM journal of computing 2(1), March 1973.
- *
- * @author harold
  */
 final class IntTreePMap<V> {
     private static final IntTreePMap<Object> EMPTY = new IntTreePMap<Object>(IntTree.EMPTYNODE);
diff --git a/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/MapEntry.java b/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/MapEntry.java
index 9251bdb4e6b..ccfa49a0878 100644
--- a/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/MapEntry.java
+++ b/core/runtime.jvm/src/kotlin/reflect/jvm/internal/pcollections/MapEntry.java
@@ -1,12 +1,21 @@
+/*
+ * Copyright 2010-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package kotlin.reflect.jvm.internal.pcollections;
 
-/**
- * <p/>
- * An Entry maintaining an immutable key and value.  This class
- * does not support method <tt>setValue</tt>.  This class may be
- * convenient in methods that return thread-safe snapshots of
- * key-value mappings.
- */
 final class MapEntry<K, V> implements java.io.Serializable {
     private static final long serialVersionUID = 7138329143949025153L;