diff --git a/doc/quickstart_traceUtils.md b/doc/quickstart_traceUtils.md
index 90acb254..78f3359a 100644
--- a/doc/quickstart_traceUtils.md
+++ b/doc/quickstart_traceUtils.md
@@ -13,20 +13,20 @@ Print requests from a trace.
 ### traceConv
 Convert a trace to oracleGeneral format so you can run it faster (10x speedup) using less memory. Meanwhile, the generated trace has a smaller size, contains next request time. 
 ```bash
-# the first parameter is the input trace, the second parameter is trace type, the third parameter is the output trace path
-./bin/traceConv ../data/cloudPhysicsIO.txt txt cloudPhysicsIO.oracleGeneral.bin
+# the first parameter is the input trace, the second parameter is trace type, the output is in the same directory with suffic oracleGeneral
+./bin/traceConv ../data/cloudPhysicsIO.txt txt
 ```
 Note that the conversion supports all trace types including csv trace. Moreover, if the object id is numeric, add the option `-t obj_id_is_num=1` to the command line, which reduces memory usage.
 
-```
-a trace using space as the delimiter and numeric object id
+```bash
+# a trace using space as the delimiter and numeric object id
 ./bin/traceConv /disk/trace.csv csv -t "time-col=1,obj-id-col=2,obj-size-col=3,delimiter= ,obj-id-is-num=1"
 ```
 
 We can also sample a trace to reduce the size of the trace. 
 ```bash
 # sample 1% of the trace
-./bin/traceConv ../data/cloudPhysicsIO.vscsi vscsi ../data/cloudPhysicsIO.oracleGeneral -s 0.01
+./bin/traceConv ../data/cloudPhysicsIO.vscsi vscsi -s 0.01
 ```
 
 
@@ -39,4 +39,3 @@ The generated trace is in oracleGeneral format.
 ./bin/traceFilter ../data/trace.vscsi vscsi --filter-type fifo --filter-size 0.01 --ignore-obj-size 1
 ```
 
-