Minor corrections to user guide (#35)

diff --git a/dubbo-user-book-en/quick-start.md b/dubbo-user-book-en/quick-start.md
index d2aa2e1..3701406 100644
--- a/dubbo-user-book-en/quick-start.md
+++ b/dubbo-user-book-en/quick-start.md
@@ -129,5 +129,5 @@
 
 
 [^1]: The interface needs to be packaged separately, shared by the service provider and the consumer
-[^2]: Hidden realization of service consumer
+[^2]: Hidden implementation of service consumer
 [^3]: IoC injection can also be used
diff --git a/dubbo-user-book-en/references/registry/zookeeper.md b/dubbo-user-book-en/references/registry/zookeeper.md
index ff3eb45..ee2bce3 100644
--- a/dubbo-user-book-en/references/registry/zookeeper.md
+++ b/dubbo-user-book-en/references/registry/zookeeper.md
@@ -1,13 +1,13 @@
 # Zookeeper Registry Server
 
-[Zookeeper](http://zookeeper.apache.org) is the child project of apache hadoop. Since it offers tree-like directory service and supports change notification, it's suitable to use it as dubbo's registry server. It's a field-proven product, therefore it's recommended to use it in the production environment. [^1]
+[Zookeeper](http://zookeeper.apache.org) is a child project of [Apache Hadoop](http://hadoop.apache.org). Since it offers tree-like directory service and supports change notification, it's suitable to use it as dubbo's registry server. It's a field-proven product, therefore it's recommended to use it in the production environment. [^1]
 
 ![/user-guide/images/zookeeper.jpg](../../sources/images/zookeeper.jpg)
 
 Description on registration procedure:
 
 * When service provider boots up: write service URL address under directory `/dubbo/com.foo.BarService/providers`
-* When service consumer boots up: subscribe to `/dubbo/com.foo.BarService/providers` for provider's URL addresses. At the same time, write consumer's URL address under `/dubbo/com.foo.BarService/providers`.
+* When service consumer boots up: subscribe to `/dubbo/com.foo.BarService/providers` for provider's URL addresses. At the same time, write consumer's URL address under `/dubbo/com.foo.BarService/consumers`.
 * When monitor center boots up: subscribe to `/dubbo/com.foo.BarService` for the URL addresses from all providers and consumers.
 
 The following abilities are supported: