diff --git a/teavm-jso-impl/src/main/java/org/teavm/jso/plugin/JS.java b/teavm-jso-impl/src/main/java/org/teavm/jso/plugin/JS.java
index 9d1c2026b..8e3bd8901 100644
--- a/teavm-jso-impl/src/main/java/org/teavm/jso/plugin/JS.java
+++ b/teavm-jso-impl/src/main/java/org/teavm/jso/plugin/JS.java
@@ -22,7 +22,6 @@ import org.teavm.javascript.spi.GeneratedBy;
 import org.teavm.javascript.spi.InjectedBy;
 import org.teavm.jso.JSBody;
 import org.teavm.jso.JSObject;
-import org.teavm.jso.JSType;
 import org.teavm.jso.core.JSArray;
 import org.teavm.jso.core.JSArrayReader;
 import org.teavm.jso.core.JSBoolean;
@@ -38,27 +37,6 @@ final class JS {
     private JS() {
     }
 
-    public static JSType getType(JSObject obj) {
-        switch (unwrapString(getTypeName(obj))) {
-            case "boolean":
-                return JSType.OBJECT;
-            case "number":
-                return JSType.NUMBER;
-            case "string":
-                return JSType.STRING;
-            case "function":
-                return JSType.FUNCTION;
-            case "object":
-                return JSType.OBJECT;
-            case "undefined":
-                return JSType.UNDEFINED;
-        }
-        throw new AssertionError("Unexpected type");
-    }
-
-    @JSBody(params = "obj", script = "return typeof(obj);")
-    private static native JSObject getTypeName(JSObject obj);
-
     /**
      * Gets global JavaScript object, that is similar to the <code>window</code> object in the browser.
      * @return global object.
diff --git a/teavm-jso/src/main/java/org/teavm/jso/JSConstructor.java b/teavm-jso/src/main/java/org/teavm/jso/JSConstructor.java
index 3e5cf7240..76b25140c 100644
--- a/teavm-jso/src/main/java/org/teavm/jso/JSConstructor.java
+++ b/teavm-jso/src/main/java/org/teavm/jso/JSConstructor.java
@@ -21,6 +21,14 @@ import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
 /**
+ * <p>Marks abstract member method as a JavaScript constructor. This is equivalent to the following:</p>
+ *
+ * <pre>{@code
+ * @JSBody(params = ..., script = "return new this.constructorName(...);")
+ * }</pre>
+ *
+ * <p>where <code>constructorName</code> is method's name by default or a name, directly specified by
+ * this annotation.</p>
  *
  * @author Alexey Andreev
  */
diff --git a/teavm-jso/src/main/java/org/teavm/jso/JSIndexer.java b/teavm-jso/src/main/java/org/teavm/jso/JSIndexer.java
index 18bdf0e8a..7f07f22ec 100644
--- a/teavm-jso/src/main/java/org/teavm/jso/JSIndexer.java
+++ b/teavm-jso/src/main/java/org/teavm/jso/JSIndexer.java
@@ -21,6 +21,21 @@ import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
 /**
+ * <p>Marks abstract member method either as an getter indexer or setter indexer.</p>
+ *
+ * <p>Getter indexer is a method that returns value and takes exactly one parameter. In
+ * this case annotation is equivalent to this:</p>
+ *
+ * <pre>{@code
+ * @JSBody(params = "index", script = "return this[index];")
+ * }</pre>
+ *
+ * <p>Setter indexer is a method that takes two parameter and does not return any value.
+ * Ins this case annotation is equivalent to the following:</p>
+ *
+ * <pre>{@code
+ * @JSBody(params = { "index", "value" }, script = "this[index] = value;")
+ * }</pre>
  *
  * @author Alexey Andreev
  */
diff --git a/teavm-jso/src/main/java/org/teavm/jso/JSMethod.java b/teavm-jso/src/main/java/org/teavm/jso/JSMethod.java
index 185ea626f..9029492ec 100644
--- a/teavm-jso/src/main/java/org/teavm/jso/JSMethod.java
+++ b/teavm-jso/src/main/java/org/teavm/jso/JSMethod.java
@@ -21,6 +21,14 @@ import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
 /**
+ * <p>Marks abstract member method as a JavaScript method. This is equivalent to the following:</p>
+ *
+ * <pre>{@code
+ * @JSBody(params = ..., script = "return new this.methodName(...);")
+ * }</pre>
+ *
+ * <p>where <code>methodName</code> is method's name by default or a name, directly specified by
+ * this annotation.</p>
  *
  * @author Alexey Andreev
  */
diff --git a/teavm-jso/src/main/java/org/teavm/jso/JSProperty.java b/teavm-jso/src/main/java/org/teavm/jso/JSProperty.java
index c61a89ebe..7cdfc6b24 100644
--- a/teavm-jso/src/main/java/org/teavm/jso/JSProperty.java
+++ b/teavm-jso/src/main/java/org/teavm/jso/JSProperty.java
@@ -21,6 +21,26 @@ import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
 /**
+ * <p>Marks abstract member method as either a getter or a setter.</p>
+ *
+ * <p>Getter's name must conform the Java Beans specification, i.e. start with <code>get</code> prefix
+ * (or <code>is</code> in case of boolean getter). It must not take any parameters and must return a value.
+ * For getter annotation is equivalent to the following:</p>
+ *
+ * <pre>{@code
+ * @JSBody(params = {}, script = "return this.propertyName;")
+ * }</pre>
+ *
+ * <p>Setter's name must conform the Java Beans specification, i.e. start with <code>set</code> prefix
+ * It must take exactly one parameter and must not return a value.
+ * For setter annotation is equivalent to the following:</p>
+ *
+ * <pre>{@code
+ * @JSBody(params = "value", script = "this.propertyName = value;")
+ * }</pre>
+ *
+ * <p>By default <code>propertyName</code> is calculated from method's name according to Java Beans specification,
+ * otherwise the name specified by annotation is taken.</p>
  *
  * @author Alexey Andreev
  */
diff --git a/teavm-jso/src/main/java/org/teavm/jso/JSType.java b/teavm-jso/src/main/java/org/teavm/jso/JSType.java
deleted file mode 100644
index c82fc6399..000000000
--- a/teavm-jso/src/main/java/org/teavm/jso/JSType.java
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- *  Copyright 2014 Alexey Andreev.
- *
- *  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 org.teavm.jso;
-
-/**
- *
- * @author Alexey Andreev
- */
-public enum JSType {
-    UNDEFINED,
-    BOOLEAN,
-    NUMBER,
-    STRING,
-    FUNCTION,
-    OBJECT
-}