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-rw-r--r--lib/fileset/README.md6
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/fileset/README.md b/lib/fileset/README.md
index a75efc496c4ed..c50f7936aa771 100644
--- a/lib/fileset/README.md
+++ b/lib/fileset/README.md
@@ -41,7 +41,7 @@ An attribute set with these values:
 - `_type` (constant string `"fileset"`):
   Tag to indicate this value is a file set.
 
-- `_internalVersion` (constant `1`, the current version):
+- `_internalVersion` (constant `2`, the current version):
   Version of the representation.
 
 - `_internalBase` (path):
@@ -67,8 +67,8 @@ An attribute set with these values:
 One of the following:
 
 - `{ <name> = filesetTree; }`:
-  A directory with a nested `filesetTree` value for every directory entry.
-  Even entries that aren't included are present as `null` because it improves laziness and allows using this as a sort of `builtins.readDir` cache.
+  A directory with a nested `filesetTree` value for directory entries.
+  Entries not included may either be omitted or set to `null`, as necessary to improve efficiency or laziness.
 
 - `"directory"`:
   A directory with all its files included recursively, allowing early cutoff for some operations.