Extend class comment for `ObjectRepository`.
PiperOrigin-RevId: 457694258
diff --git a/lifetime_analysis/object_repository.h b/lifetime_analysis/object_repository.h
index ad7f16c..be9c250 100644
--- a/lifetime_analysis/object_repository.h
+++ b/lifetime_analysis/object_repository.h
@@ -36,6 +36,11 @@
// A repository for the objects used in the lifetime analysis of a single
// function.
+// This class establishes a relationship between AST nodes (e.g. variable
+// declarations) and the objects that represent them. It also stores additional
+// information about objects that does not change during the analysis.
+// The `ObjectRepository` only stores state that does not change during the
+// analysis; it is therefore not part of the lattice.
class ObjectRepository {
public:
// An `Object` might represent objects that have either a single value (such
