diff --git a/lib/database.js b/lib/database.js
index 36274fc..efa02ac 100644
--- a/lib/database.js
+++ b/lib/database.js
@@ -43,7 +43,10 @@
 
 const pmemkv = require('bindings')('pmemkv');
 
-/** @class Main Node.js pmemkv class, it provides functions to operate on data in database. */
+/** @class Main Node.js pmemkv class, it provides functions to operate on data in database.
+ *		If an error/exception is thrown from a method it will contain *status* variable.
+ *		Possible statuses are enumerated in constants.status.
+*/
 class db {
 	/**
 	 * Creates an instance of db.
@@ -81,19 +84,19 @@ class db {
 
 	/**
 	 * Executes function for every record stored in db. Callback is called
-	 *	only with key of each record.
+	 *	only with the key of each record.
 	 *
 	 * @throws {Error} on any failure.
 	 * @param {Function} callback - function to be called for every element stored in db.
 	 *		It has only one param - key (for each returned element).
 	 */
 	get_keys(callback) {
-		this._db.get_all(callback);
+		this._db.get_keys(callback);
 	}
 
 	/**
-	 * Executes function for every record stored in db, whose keys are
-	 *	greater than *key*. Callback is called only with key of each record.
+	 * Executes function for every record stored in db, whose keys are greater
+	 *	than the given *key*. Callback is called only with the key of each record.
 	 *
 	 * @throws {Error} on any failure.
 	 * @param {string} key - sets the lower bound for querying.
@@ -101,12 +104,12 @@ class db {
 	 *		It has only one param - key (for each returned element).
 	 */
 	get_keys_above(key, callback) {
-		this._db.get_above(key, callback);
+		this._db.get_keys_above(key, callback);
 	}
 
 	/**
-	 * Executes function for every record stored in db, whose keys are
-	 *	less than the *key*. Callback is called only with key of each record.
+	 * Executes function for every record stored in db, whose keys are less than
+	 *	the given *key*. Callback is called only with the key of each record.
 	 *
 	 * @throws {Error} on any failure.
 	 * @param {string} key - sets the upper bound for querying.
@@ -114,13 +117,13 @@ class db {
 	 *		It has only one param - key (for each returned element).
 	 */
 	get_keys_below(key, callback) {
-		this._db.get_below(key, callback);
+		this._db.get_keys_below(key, callback);
 	}
 
 	/**
 	 * Executes function for every record stored in db, whose keys are
-	 *	greater than *key1* and less than *key2*. Callback is called
-	 *	only with key of each record.
+	 *	greater than the *key1* and less than the *key2*. Callback is
+	 *	called only with the key of each record.
 	 *
 	 * @throws {Error} on any failure.
 	 * @param {string} key1 - sets the lower bound for querying.
@@ -129,7 +132,7 @@ class db {
 	 *		It has only one param - key (for each returned element).
 	 */
 	get_keys_between(key1, key2, callback) {
-		this._db.get_between(key1, key2, callback);
+		this._db.get_keys_between(key1, key2, callback);
 	}
 
 	/**
@@ -171,7 +174,7 @@ class db {
 
 	/**
 	 * Returns number of currently stored elements in db, whose keys are
-	 *	greater than *key1* and less than *key2*.
+	 *	greater than the *key1* and less than the *key2*.
 	 *
 	 * @throws {Error} on any failure.
 	 * @param {string} key1 - sets the lower bound of counting.
@@ -195,7 +198,7 @@ class db {
 
 	/**
 	 * Executes function for every record stored in db, whose keys are
-	 *	greater than *key*.
+	 *	greater than the given *key*.
 	 *
 	 * @throws {Error} on any failure.
 	 * @param {string} key - sets the lower bound for querying.
@@ -207,7 +210,7 @@ class db {
 
 	/**
 	 * Executes function for every record stored in db, whose keys are
-	 *	less than the *key*.
+	 *	less than the given *key*.
 	 *
 	 * @throws {Error} on any failure.
 	 * @param {string} key - sets the upper bound for querying.
@@ -219,7 +222,7 @@ class db {
 
 	/**
 	 * Executes function for every record stored in db, whose keys are
-	 *	greater than *key1* and less than *key2*.
+	 *	greater than the *key1* and less than the *key2*.
 	 *
 	 * @throws {Error} on any failure.
 	 * @param {string} key1 - sets the lower bound for querying.