diff --git a/docs/design/sdk-api.md b/docs/design/sdk-api.md
index e0d1467..2cceeeb 100644
--- a/docs/design/sdk-api.md
+++ b/docs/design/sdk-api.md
@@ -407,7 +407,7 @@ public interface Recording extends AutoCloseable {
 public interface StubRef {
   int index(); Optional<String> id();
   Stub definition();
-  void replace(StubSpec spec); void delete();
+  void replace(StubSpec spec); void delete();  // from rift 0.23.0 a by-index replace restarts the response cycle; by id keeps it (rift#1515)
   void replace(JsonValue stub);               // escape hatch
 }
 
diff --git a/docs/recording.md b/docs/recording.md
index 46aff8a..4abd4df 100644
--- a/docs/recording.md
+++ b/docs/recording.md
@@ -46,6 +46,11 @@ RecordSpec spec = RecordSpec.builder()
 | `void persist(Path file)` | `stop()`, then write the replayable imposter JSON to `file`. |
 | `void close()` | `stop()`. |
 
+From rift 0.23.0, an `ALWAYS` (`proxyAlways`) recording's responses also carry `_proxyResponseTime`,
+the origin's response time (rift#1519). The model keeps it through `IsResponse.extra`, so it survives
+`persist` and a replay. `Imposter.clearProxyResponses()` then also strips the responses `proxyAlways`
+appended to stubs you declared, and restarts every remaining stub's response cycle.
+
 `persist(file)` writes the engine's **replayable imposter definition** — the same format loadable by
 `rift --configfile`, rift-node, and rift-scala — so a captured golden file is portable across SDKs.
 
diff --git a/rift-java-core/src/main/java/io/github/achirdlabs/rift/Imposter.java b/rift-java-core/src/main/java/io/github/achirdlabs/rift/Imposter.java
index dcc5a0c..c33e7ca 100644
--- a/rift-java-core/src/main/java/io/github/achirdlabs/rift/Imposter.java
+++ b/rift-java-core/src/main/java/io/github/achirdlabs/rift/Imposter.java
@@ -159,6 +159,10 @@ public interface Imposter {
      * <p>From rift 0.19.0 this also deletes every stub a proxy recorded (one carrying {@code
      * recordedFrom}, e.g. from {@code predicateGenerators}), matching Mountebank; stubs you declared
      * are kept. Through 0.18.x the recorded stubs survived the call.
+     *
+     * <p>From rift 0.23.0 (rift#1519) it also strips the responses a {@code proxyAlways} proxy
+     * appended to stubs you declared, leaving those stubs as you wrote them, and restarts the
+     * response cycle of every stub that remains, as Mountebank does.
      */
     void clearProxyResponses();
 
diff --git a/rift-java-core/src/main/java/io/github/achirdlabs/rift/StubRef.java b/rift-java-core/src/main/java/io/github/achirdlabs/rift/StubRef.java
index 88987df..c24b0eb 100644
--- a/rift-java-core/src/main/java/io/github/achirdlabs/rift/StubRef.java
+++ b/rift-java-core/src/main/java/io/github/achirdlabs/rift/StubRef.java
@@ -15,6 +15,12 @@ public interface StubRef {
 
     Stub definition();
 
+    /**
+     * Replaces this reference's stub. From rift 0.23.0 (rift#1515), replacing a stub addressed by
+     * index (the reference {@code addStub} returns) restarts its response cycle at the first
+     * response, as Mountebank does, even when the content is unchanged; replacing one addressed by
+     * id ({@link Imposter#stub(String)}) keeps the cycle where it was.
+     */
     void replace(StubSpec spec);
 
     /**
diff --git a/rift-java-core/src/main/java/io/github/achirdlabs/rift/dsl/RequestField.java b/rift-java-core/src/main/java/io/github/achirdlabs/rift/dsl/RequestField.java
index 00f8f7f..112e8af 100644
--- a/rift-java-core/src/main/java/io/github/achirdlabs/rift/dsl/RequestField.java
+++ b/rift-java-core/src/main/java/io/github/achirdlabs/rift/dsl/RequestField.java
@@ -11,9 +11,18 @@ public enum RequestField {
     QUERY("query"),
     HEADERS("headers"),
     BODY("body"),
-    /** The client's address and port, so in effect it matches only that one connection. */
+    /**
+     * The client's address and port, so in effect it matches only that one connection. See {@link
+     * #IP} for how an IPv4 client is written on a dual-stack imposter.
+     */
     REQUEST_FROM("requestFrom"),
-    /** The client's IP address. */
+    /**
+     * The client's IP address. From rift 0.23.0 (rift#1514) a host-less imposter on an embedded
+     * engine or in a {@code RiftContainer} listens dual-stack and records an IPv4 client in
+     * IPv4-mapped form, {@code ::ffff:127.0.0.1}, so a predicate written as {@code 127.0.0.1} no
+     * longer matches there; give the imposter {@code host("127.0.0.1")} to keep it IPv4. A spawned
+     * engine's imposters bind its {@code --host} and record plain IPv4.
+     */
     IP("ip"),
     /** The urlencoded form body, recorded like {@link #QUERY}; nothing is recorded for a request with no form. */
     FORM("form");