diff --git a/README.md b/README.md
index e125bce..759f21c 100644
--- a/README.md
+++ b/README.md
@@ -94,4 +94,15 @@ Options:
 
 Example:
 
-    sudo rsync -razPvp calibre orangepi@192.168.1.4:/home/nvme/dockerdata
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+    sudo rsync -razPvp calibre orangepi@192.168.1.4:/home/nvme/dockerdata
+
+## Grep (ricerca stringa)
+
+per cercare una stringa
+
+    grep -rl "string" /path
+
+opzioni usate
+
+    -r (or --recursive) option is used to traverse also all sub-directories of /path, whereas
+    -l (or --files-with-matches) option is used to only print filenames of matching files, 
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