diff --git a/docs/Details_Usage.md b/docs/Details_Usage.md
index 789a0119e90bc242597b8f5ca6ee0feb5050c63a..2857246aa0794388c70476db41a01dd655430561 100644
--- a/docs/Details_Usage.md
+++ b/docs/Details_Usage.md
@@ -285,6 +285,7 @@ evtList[0] = "sched:sched_switch";
 PmuAttr attr = {0};
 attr.evtList = evtList;
 attr.numEvt = 1;
+int pd = PmuOpen(SAMPLING, &attr);
 ```
 
 ```python
@@ -295,6 +296,7 @@ pmu_attr = kperf.PmuAttr(
     sampleRate=1000,
     symbolMode=kperf.SymbolMode.RESOLVE_ELF # 不需要符号解析，可以不使用该参数
 )
+pd = kperf.open(kperf.PmuTaskType.SAMPLING, pmu_attr)
 ```
 
 tracepoint支持Counting和Sampling两种模式，API调用流程和两者相似。
diff --git a/docs/Python_API.md b/docs/Python_API.md
index 0a8586d655ce6c6e3d9c5f7a1b15121e6fc5735d..1725879ab8a44dd02948328d899cf38844152c8c 100644
--- a/docs/Python_API.md
+++ b/docs/Python_API.md
@@ -22,7 +22,7 @@ kperf.open(collector_type=kperf.PmuTaskType, pmu_attr=kperf.PmuAttr)
     * sampleRate
     采样频率，可通过/proc/sys/kernel/perf_event_max_sample_rate调整最大的采样频率
     * useFreq
-    是否启用采样频率，如果设置，将可以使用采用频率
+    是否启用采样频率，如果设置，将可以使用采样频率
     * excludeUser
     排除对用户态数据的采集
     * excludeKernel