diff --git a/Initialization-options.md b/Initialization-options.md
index 4cb131f..5ba4c78 100644
--- a/Initialization-options.md
+++ b/Initialization-options.md
@@ -123,11 +123,13 @@ This is best used in conjunction with empty `cacheDirectory` to avoid writing ca
 
 Default: 2
 
-If `a.h` has been changed, when you open `a.cc` which includes `a.h`, an index request will be sent and `a.cc` will be reparsed.
+This options controls whether a file should be re-indexed when any of its dependencies changes timestamp.
 
-If set to 0, `a.cc` will not be reparsed because its dependencies (included files) have changed timestamps.
+If `a.h` has been changed, when you open `a.cc` which includes `a.h`, an index request will be sent.
 
-1 sits between the two cases: the 2 behavior (default) is used before the initial load while the 0 behavior is used afterwards.
+* 0: no re-indexing unless `a.cc` itself changes timestamp.
+* 2: the index of `a.cc` is considered stale and it should be re-indexed.
+* 1: before the initial load, the behavior of 2 is used, otherwise the behavior of 0 is used.
 
 ## `completion.filterAndSort`: completion filtering and sorting