Update readme

mliezun · Apr 12, 2024 · 75f2940 · 75f2940
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@@ -187,6 +187,7 @@ $ ./grotksy embed grep.grc
 Now we should have a `grep.exe` in our directory. And we can use it:
 
 ```
+$ chmod +x grep.exe
 $ cat file.txt | ./grep.exe pattern
 ```