diff --git a/notes/计算机操作系统.md b/notes/计算机操作系统.md
index 89958614..18074fee 100644
--- a/notes/计算机操作系统.md
+++ b/notes/计算机操作系统.md
@@ -310,7 +310,7 @@ semaphore full = 0;
 
 void producer() {
     while(TRUE){
-        int item = produce_item;
+        int item = produce_item();
         down(empty);
         down(mutex);
         insert_item(item);
@@ -323,7 +323,7 @@ void consumer() {
     while(TRUE){
         down(full);
         down(mutex);
-        int item = remove_item(item);
+        int item = remove_item();
         up(mutex);
         up(empty);
         consume_item(item);