path: root/Documentation/glossary-content.txt
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diff --git a/Documentation/glossary-content.txt b/Documentation/glossary-content.txt
index 023ca95..8d38ae6 100644
--- a/Documentation/glossary-content.txt
+++ b/Documentation/glossary-content.txt
@@ -287,6 +287,15 @@ This commit is referred to as a "merge commit", or sometimes just a
origin/name-of-upstream-branch, which you can see using
`git branch -r`.
+ Only update and add files to the working directory, but don't
+ delete them, similar to how 'cp -R' would update the contents
+ in the destination directory. This is the default mode in a
+ <<def_checkout,checkout>> when checking out files from the
+ <<def_index,index>> or a <<def_tree-ish,tree-ish>>. In
+ contrast, no-overlay mode also deletes tracked files not
+ present in the source, similar to 'rsync --delete'.
A set of objects which have been compressed into one file (to save space
or to transmit them efficiently).