diff --git a/books/les-commandes-linux.json b/books/les-commandes-linux.json
index f173c3f..e9680be 100644
--- a/books/les-commandes-linux.json
+++ b/books/les-commandes-linux.json
@@ -24,6 +24,7 @@
         "route",
         "nslookup",
         "file",
+        "which",
         "dd",
         "cp",
         "mv",