diff --git a/framework/yii/ar/ActiveQueryInterface.php b/framework/yii/ar/ActiveQueryInterface.php
index e2bb780..ddcb027 100644
--- a/framework/yii/ar/ActiveQueryInterface.php
+++ b/framework/yii/ar/ActiveQueryInterface.php
@@ -9,7 +9,7 @@ namespace yii\ar;
 use yii\db\QueryInterface;
 
 /**
- * ActiveQueryInterface defines the common interface to be implemented by active record relation classes.
+ * ActiveQueryInterface defines the common interface to be implemented by active record query classes.
  *
  * A class implementing this interface should also use [[ActiveQueryTrait]].
  *
diff --git a/framework/yii/ar/ActiveQueryTrait.php b/framework/yii/ar/ActiveQueryTrait.php
index 8c8d6c0..e45f72a 100644
--- a/framework/yii/ar/ActiveQueryTrait.php
+++ b/framework/yii/ar/ActiveQueryTrait.php
@@ -10,30 +10,7 @@ namespace yii\ar;
 use yii\db\ActiveRecord;
 
 /**
- * ActiveQueryTrait implements the common set of methods that are used by DB queries associated with an Active Record class.
- *
- * ActiveQuery mainly provides the following methods to retrieve the query results:
- *
- * - [[one()]]: returns a single record populated with the first row of data.
- * - [[all()]]: returns all records based on the query results.
- * - [[count()]]: returns the number of records.
- * - [[scalar()]]: returns the value of the first column in the first row of the query result.
- * - [[exists()]]: returns a value indicating whether the query result has data or not.
- *
- * Because ActiveQuery extends from [[Query]], one can use query methods, such as [[where()]],
- * [[orderBy()]] to customize the query options.
- *
- * ActiveQuery also provides the following additional query options:
- *
- * - [[with()]]: list of relations that this query should be performed with.
- * - [[indexBy()]]: the name of the column by which the query result should be indexed.
- * - [[asArray()]]: whether to return each record as an array.
- *
- * These options can be configured using methods of the same name. For example:
- *
- * ~~~
- * $customers = Customer::find()->with('orders')->asArray()->all();
- * ~~~
+ * ActiveQueryTrait implements the common methods and properties for active record query classes.
  *
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @author Carsten Brandt <mail@cebe.cc>
diff --git a/framework/yii/ar/ActiveRelationInterface.php b/framework/yii/ar/ActiveRelationInterface.php
index 70b723a..1d58a7d 100644
--- a/framework/yii/ar/ActiveRelationInterface.php
+++ b/framework/yii/ar/ActiveRelationInterface.php
@@ -10,6 +10,8 @@ namespace yii\ar;
 /**
  * ActiveRelationInterface defines the common interface to be implemented by active record relation classes.
  *
+ * A class implementing this interface should also use [[ActiveRelationTrait]].
+ *
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @author Carsten Brandt <mail@cebe.cc>
  * @since 2.0
diff --git a/framework/yii/ar/ActiveRelationTrait.php b/framework/yii/ar/ActiveRelationTrait.php
index 5d49641..6b617bc 100644
--- a/framework/yii/ar/ActiveRelationTrait.php
+++ b/framework/yii/ar/ActiveRelationTrait.php
@@ -11,16 +11,7 @@ use yii\base\InvalidConfigException;
 use yii\db\ActiveRecord;
 
 /**
- * ActiveRelation represents a relation between two Active Record classes.
- *
- * ActiveRelation instances are usually created by calling [[ActiveRecord::hasOne()]] and
- * [[ActiveRecord::hasMany()]]. An Active Record class declares a relation by defining
- * a getter method which calls one of the above methods and returns the created ActiveRelation object.
- *
- * A relation is specified by [[link]] which represents the association between columns
- * of different tables; and the multiplicity of the relation is indicated by [[multiple]].
- *
- * If a relation involves a pivot table, it may be specified by [[via()]] or [[viaTable()]] method.
+ * ActiveRelationTrait implements the common methods and properties for active record relation classes.
  *
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @author Carsten Brandt <mail@cebe.cc>