diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 706eef2..f25d900 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -3,6 +3,7 @@
   <component name="ChangeListManager">
     <list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/Rocket.md" beforeDir="false" afterPath="$PROJECT_DIR$/Rocket.md" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -245,7 +246,7 @@
       <workItem from="1581061282899" duration="70334000" />
       <workItem from="1581749148787" duration="1225000" />
       <workItem from="1581847341168" duration="16207000" />
-      <workItem from="1582007077483" duration="623000" />
+      <workItem from="1582007077483" duration="836000" />
     </task>
     <task id="LOCAL-00001" summary="add q5/q7/q172">
       <created>1580045439607</created>
@@ -471,7 +472,14 @@
       <option name="project" value="LOCAL" />
       <updated>1581957264975</updated>
     </task>
-    <option name="localTasksCounter" value="33" />
+    <task id="LOCAL-00033" summary="update Rocket.md">
+      <created>1582020729706</created>
+      <option name="number" value="00033" />
+      <option name="presentableId" value="LOCAL-00033" />
+      <option name="project" value="LOCAL" />
+      <updated>1582020729706</updated>
+    </task>
+    <option name="localTasksCounter" value="34" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -544,10 +552,10 @@
     <MESSAGE value="update q10/q746" />
     <MESSAGE value="update q10" />
     <MESSAGE value="update q206" />
-    <MESSAGE value="update Rocket.md" />
     <MESSAGE value="rename package" />
     <MESSAGE value="update README.md" />
-    <option name="LAST_COMMIT_MESSAGE" value="update README.md" />
+    <MESSAGE value="update Rocket.md" />
+    <option name="LAST_COMMIT_MESSAGE" value="update Rocket.md" />
   </component>
   <component name="WindowStateProjectService">
     <state x="320" y="115" key="#Inspections" timestamp="1581061018990">
@@ -562,10 +570,10 @@
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="533" y="166" key="#com.intellij.ide.util.MemberChooser/0.0.1440.900@0.0.1440.900" timestamp="1578548165321" />
-    <state x="303" y="50" key="CommitChangelistDialog2" timestamp="1581957264738">
+    <state x="303" y="50" key="CommitChangelistDialog2" timestamp="1582020729240">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="303" y="50" key="CommitChangelistDialog2/0.0.1440.900@0.0.1440.900" timestamp="1581957264738" />
+    <state x="303" y="50" key="CommitChangelistDialog2/0.0.1440.900@0.0.1440.900" timestamp="1582020729240" />
     <state x="144" y="78" width="1152" height="720" key="DiffContextDialog" timestamp="1581927787180">
       <screen x="0" y="23" width="1440" height="797" />
     </state>
@@ -615,10 +623,10 @@
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="221" y="63" key="SettingsEditor/0.0.1440.900@0.0.1440.900" timestamp="1581061096545" />
-    <state x="320" y="190" key="Vcs.Push.Dialog.v2" timestamp="1581957266196">
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2" timestamp="1582020731697">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1581957266196" />
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1582020731697" />
     <state x="100" y="100" width="1240" height="700" key="com.intellij.history.integration.ui.views.DirectoryHistoryDialog" timestamp="1581744794182">
       <screen x="0" y="23" width="1440" height="797" />
     </state>
diff --git a/Rocket.md b/Rocket.md
index 05b3cea..c2577a1 100644
--- a/Rocket.md
+++ b/Rocket.md
@@ -552,7 +552,7 @@ void quick_sort(int a[], int low, int high){
 
 ## 实际问题
 
-### 高并发系统的限流详解及实现
+### 高并发系统的设计与实现
 
 在开发高并发系统时有三把利器用来保护系统：缓存、降级和限流。