diff --git a/bip-0138.md b/bip-0138.md
index 98a77019..90ae803e 100644
--- a/bip-0138.md
+++ b/bip-0138.md
@@ -10,6 +10,7 @@
   Discussion: https://delvingbitcoin.org/t/a-simple-backup-scheme-for-wallet-accounts/1607
               https://groups.google.com/g/bitcoindev/c/5NgJbpVDgEc/m/TtGK9sF9BgAJ
               https://github.com/bitcoin/bips/pull/1951
+  Version: 0.1.1
   Requires: 32, 340, 380, 388, 389
 ```
 
@@ -473,17 +474,21 @@ For BIP389 multipath descriptors, `/<0;1>` means receive and change,
 respectively. The `change_descriptor` field MUST NOT be used.
 
 For descriptors without BIP389 multipath key expressions, `descriptor` is the
-receive descriptor and `change_descriptor` is the change descriptor.
+receive descriptor. The optional `change_descriptor` string can be omitted for a
+receive-only set.
 
 If optional boolean `archived` is `true`, importing wallets SHOULD NOT use the
 descriptor set for new address generation.
 
 `range` is an optional two-element array `[start, end]`, inclusive, describing
-the ranged derivation indexes covered by the descriptor set.
+the [BIP32](bip-0032.mediawiki) non-hardened child indexes covered by the
+descriptor set, with `start <= end`.
 
 `birth_time` is an optional integer Unix timestamp in seconds, indicating a
 lower bound for when the descriptor set may have received funds. Importing
 wallets MAY use this value as a scanning hint.
+If `0` or omitted, no lower bound is known. Importers SHOULD scan from the wallet
+birthday if known, otherwise from genesis.
 
 #### BIP388 Wallet Policy Backup Content
 
@@ -519,12 +524,15 @@ optional metadata fields:
 If optional boolean `archived` is `true`, importing wallets SHOULD NOT use the
 policy for new address generation.
 
-`range` is an optional two-element array `[start, end]`, inclusive, describing the
-ranged derivation indexes covered by the policy.
+`range` is an optional two-element array `[start, end]`, inclusive, describing
+the [BIP32](bip-0032.mediawiki) non-hardened child indexes covered by the
+policy, with `start <= end`.
 
 `birth_time` is an optional integer Unix timestamp in seconds, indicating a lower
 bound for when the policy may have received funds. Importing wallets MAY use this
 value as a scanning hint.
+If `0` or omitted, no lower bound is known. Importers SHOULD scan from the wallet
+birthday if known, otherwise from genesis.
 
 ##### Multiple Policies Document
 
@@ -617,3 +625,11 @@ Thanks to @Sjors for extensive reviews, many design contributions to the payload
 encoding, and a proof-of-concept implementation on top of Bitcoin Core. Thanks
 also to @murchandamus, @jonatack, @craigraw, @jp1ac4, and @torkelrogstad for
 their reviews and suggestions.
+
+## Changelog
+
+* __0.1.1__ (2026-09-23):
+    * Clarify derivation range bounds and zero or omitted birth-time semantics for descriptors and policies.
+    * Clarify receive-only descriptor sets and add a corresponding test vector.
+* __0.1.0__ (2026-09-21):
+    * Initial publication.
diff --git a/bip-0138/test_vectors/bip380_descriptor_backup.json b/bip-0138/test_vectors/bip380_descriptor_backup.json
index 719d0e11..3066c8b3 100644
--- a/bip-0138/test_vectors/bip380_descriptor_backup.json
+++ b/bip-0138/test_vectors/bip380_descriptor_backup.json
@@ -29,5 +29,17 @@
         }
       ]
     }
+  },
+  {
+    "description": "Receive-only descriptor set without optional metadata",
+    "valid": true,
+    "document": {
+      "version": 1,
+      "descriptor_sets": [
+        {
+          "descriptor": "wpkh([d34db33f/84h/1h/0h]tpubDC5FSnBiZDMmhiuCmWAYsLwgLYrrT9rAqvTySfuCCrgsWz8wxMXUS9Tb9iVMvcRbvFcAHGkMD5Kx8koh4GquNGNTfohfk7pgjhaPCdXpoba/0/*)"
+        }
+      ]
+    }
   }
 ]