@@ -1 +1,2 @@
hello world!
+hello world, again
-$ git update-index file.txt
+$ git add file.txt
$ git diff
------------------------------------------------
hello world, again
------------------------------------------------
-So what our "git update-index" did was store a new blob and then put
+So what our "git add" did was store a new blob and then put
a reference to it in the index file. If we modify the file again,
we'll see that the new modifications are reflected in the "git-diff"
output: