README.md: some corrections

README.md

@@ -1,10 +1,15 @@
 # shared memory
 Simple example of inter process communication with shm_open().
 
-The main process forks itself and then waits for the child to finish. The child writes into a shared memory and exits. After that the main process prints what the child wrote into the shared memory.
+The main process forks itself and then prints whatever the child writes into te shared memory. The child writes 5 time "hallo <#>" and then exits. After printing 5 times whatever the child wrote, the main process unlinks the shared memory object.
 
 ## Note
 The file noerror.c does the same as main.c, but no error handling.
+
+If you kill the process before exiting, you need to close the shared memory object manually. 
+```bash
+rm -f /dev/shm/SHARED_MEM
+```
 ## compile
 ```bash
 make