diff --git a/src/main/java/org/redisson/core/RCollectionAsync.java b/src/main/java/org/redisson/core/RCollectionAsync.java
index 239f8dbae..61cfc790e 100644
--- a/src/main/java/org/redisson/core/RCollectionAsync.java
+++ b/src/main/java/org/redisson/core/RCollectionAsync.java
@@ -21,16 +21,70 @@ import io.netty.util.concurrent.Future;
 
 public interface RCollectionAsync<V> extends RExpirableAsync {
 
+    /**
+     * Retains only the elements in this collection that are contained in the
+     * specified collection (optional operation).  In other words, removes from
+     * this collection all of its elements that are not contained in the
+     * specified collection.
+     *
+     * @param c collection containing elements to be retained in this collection
+     * @return <tt>true</tt> if this collection changed as a result of the call
+     */
     Future<Boolean> retainAllAsync(Collection<?> c);
 
+    /**
+     * Removes all of this collection's elements that are also contained in the
+     * specified collection (optional operation).  After this call returns,
+     * this collection will contain no elements in common with the specified
+     * collection.
+     *
+     * @param c collection containing elements to be removed from this collection
+     * @return <tt>true</tt> if this collection changed as a result of the
+     *         call
+     */
     Future<Boolean> removeAllAsync(Collection<?> c);
 
+    /**
+     * Returns <tt>true</tt> if this collection contains the specified element.
+     * More formally, returns <tt>true</tt> if and only if this collection
+     * contains at least one element <tt>e</tt> such that
+     * <tt>(o==null&nbsp;?&nbsp;e==null&nbsp;:&nbsp;o.equals(e))</tt>.
+     *
+     * @param o element whose presence in this collection is to be tested
+     * @return <tt>true</tt> if this collection contains the specified
+     *         element
+     */
     Future<Boolean> containsAsync(Object o);
 
+    /**
+     * Returns <tt>true</tt> if this collection contains all of the elements
+     * in the specified collection.
+     *
+     * @param  c collection to be checked for containment in this collection
+     * @return <tt>true</tt> if this collection contains all of the elements
+     *         in the specified collection
+     */
     Future<Boolean> containsAllAsync(Collection<?> c);
 
+    /**
+     * Removes a single instance of the specified element from this
+     * collection, if it is present (optional operation).  More formally,
+     * removes an element <tt>e</tt> such that
+     * <tt>(o==null&nbsp;?&nbsp;e==null&nbsp;:&nbsp;o.equals(e))</tt>, if
+     * this collection contains one or more such elements.  Returns
+     * <tt>true</tt> if this collection contained the specified element (or
+     * equivalently, if this collection changed as a result of the call).
+     *
+     * @param o element to be removed from this collection, if present
+     * @return <tt>true</tt> if an element was removed as a result of this call
+     */
     Future<Boolean> removeAsync(Object o);
 
+    /**
+     * Returns the number of elements in this collection.
+     *
+     * @return
+     */
     Future<Integer> sizeAsync();
 
     Future<Boolean> addAsync(V e);
diff --git a/src/main/java/org/redisson/core/RLock.java b/src/main/java/org/redisson/core/RLock.java
index 9126730c3..174c941de 100644
--- a/src/main/java/org/redisson/core/RLock.java
+++ b/src/main/java/org/redisson/core/RLock.java
@@ -122,7 +122,7 @@ public interface RLock extends Lock, RExpirable {
 
     Future<Void> lockAsync(long leaseTime, TimeUnit unit);
 
-    Future<Boolean> tryLockAsync(long time, TimeUnit unit);
+    Future<Boolean> tryLockAsync(long waitTime, TimeUnit unit);
 
     Future<Boolean> tryLockAsync(final long waitTime, final long leaseTime, final TimeUnit unit);
 
diff --git a/src/main/java/org/redisson/core/RMapAsync.java b/src/main/java/org/redisson/core/RMapAsync.java
index 36abdd095..7d4461b1b 100644
--- a/src/main/java/org/redisson/core/RMapAsync.java
+++ b/src/main/java/org/redisson/core/RMapAsync.java
@@ -45,7 +45,7 @@ public interface RMapAsync<K, V> extends RExpirableAsync {
     /**
      * Removes <code>keys</code> from map by one operation in async manner
      *
-     * Works faster than <code>RMap.removeAsync</code> but not returning
+     * Works faster than <code>RMap.removeAsync</code> but doesn't return
      * the value associated with <code>key</code>
      *
      * @param keys