fix doc

README.md

@@ -81,6 +81,34 @@ After the uberjar is created, you can start the system
   
   > bin/start
 
+A simple example
+-----------------
+
+For example, we need to recommend articles to users, we may follow below steps:
+
+Setup
+
+    > bmk b2048 t1 t2 t3 ... t2047 t2048
+    > vmk b2048 article
+    > vmk b2048 userprofile
+    > rmk userprofile article cosinesq
+
+Fill data
+
+    > vadd article 1 0.11 0.112 0.1123...
+    > vadd article 2 0.21 0.212 0.2123...
+    ...    
+
+    > vadd userprofile 1 0.11 0.112 0.1123...
+    > vadd userprofile 2 0.21 0.212 0.2123...
+    ...
+
+Query
+
+    > rrec userprofile 2 article
+
+All commands are explained in next section.
+
 Core commands
 --------------
 Then you can use redis-cli to connect to simbase directly
@@ -170,32 +198,6 @@ Recommendation related
     
     Recommend articles for user 87654321
 
-A simple example
------------------
-
-For example, we need to recommend articles to users, we may follow below steps:
-
-Setup
-
-    > bmk b2048 t1 t2 t3 ... t2047 t2048
-    > vmk b2048 article
-    > vmk b2048 userprofile
-    > rmk userprofile article cosinesq
-
-Fill data
-
-    > vadd article 1 0.11 0.112 0.1123...
-    > vadd article 2 0.21 0.212 0.2123...
-    ...    
-
-    > vadd userprofile 1 0.11 0.112 0.1123...
-    > vadd userprofile 2 0.21 0.212 0.2123...
-    ...
-
-Query
-
-    > rrec userprofile 2 article
-
 Licenses
 ---------