Supporting-and-Using-Extra-Input-Messages.md

@@ -213,7 +213,7 @@ BOOL InitCustomInput (INPUT* input, const char* mdev, const char* mtype);
 void TermCustomInput (void);
 ```
 
-In `InitCustomInput` function, you should fill the operators (the callbacks)
+In `InitCustomInput` function, you should fill the operations (the callbacks)
 of `input` argument, the pointer to a INPUT structure:
 
 ```cpp
@@ -250,7 +250,7 @@ typedef struct tagINPUT {
 } INPUT;
 ```
 
-The key to support extra input messages is the new operator: `wait_event_ex`.
+The key to support extra input messages is the new operation: `wait_event_ex`.
 If you implement `wait_event_ex`, you can set `wait_event` to be NULL.
 
 In the implementation of `wait_event_ex`, when there is an extra input message,
@@ -265,7 +265,7 @@ you should:
     extra->lparam = MAKELONG(mouse_event->sv, mouse_event->dsv);
 ```
 
-1. Make sure the return value of this operator have the bit of `IAL_EVENT_EXTRA` set:
+1. Make sure the return value of this operation has the bit of `IAL_EVENT_EXTRA` set:
 
 ```cpp
     retval |= IAL_EVENT_EXTRA;