Use recursive grep in the no-shell example

README.md

@@ -56,8 +56,8 @@ hyperfine --warmup 3 'grep -R TODO *'
 ```
 
 Conversely, if you want to run the benchmark for a cold cache, you can use the `-p`/`--prepare`
-option to run a special command before *each* timing run. For example, to clear Linux filesystem caches,
-you can run
+option to run a special command before *each* timing run. For example, to clear harddisk caches
+on Linux, you can run
 ```sh
 sync; echo 3 | sudo tee /proc/sys/vm/drop_caches
 ```
@@ -104,7 +104,7 @@ If you want to run a benchmark *without an intermediate shell*, you can use the
 option. This is helpful for very fast commands (< 5 ms) where the shell startup overhead correction would
 produce a significant amount of noise. Note that you cannot use shell syntax like `*` or `~` in this case.
 ```
-hyperfine -N 'grep TODO /home/user'
+hyperfine -N 'grep -R TODO /home/user'
 ```