diff --git a/basics.html b/basics.html
index 425dfa543f3bdfc888ed4e9466e3bd31eacd8f21..2de460844e0aea481cecc829b0961f4b3a6afec6 100644
--- a/basics.html
+++ b/basics.html
@@ -281,7 +281,10 @@
             # sub-command
             git status
 
-            # optional
+            # argument
+            git diff README.md
+
+            # optional argument
             git diff [--staged]
             ```
           </section>