diff --git a/docs/reference/transcript-hygiene.md b/docs/reference/transcript-hygiene.md
index fd23d9c19..5155f2f29 100644
--- a/docs/reference/transcript-hygiene.md
+++ b/docs/reference/transcript-hygiene.md
@@ -95,7 +95,7 @@ external end-user instructions.
 **OpenAI / OpenAI Codex**
 
 - Image sanitization only.
-- On model switch into OpenAI Responses/Codex, drop orphaned reasoning signatures (standalone reasoning items without a following content block).
+- Drop orphaned reasoning signatures (standalone reasoning items without a following content block) for OpenAI Responses/Codex transcripts.
 - No tool call id sanitization.
 - No tool result pairing repair.
 - No turn validation or reordering.
diff --git a/src/agents/pi-embedded-runner.sanitize-session-history.test.ts b/src/agents/pi-embedded-runner.sanitize-session-history.test.ts
index 97358da85..78a787990 100644
--- a/src/agents/pi-embedded-runner.sanitize-session-history.test.ts
+++ b/src/agents/pi-embedded-runner.sanitize-session-history.test.ts
@@ -225,7 +225,7 @@ describe("sanitizeSessionHistory", () => {
     expect(result).toEqual([]);
   });
 
-  it("downgrades openai reasoning only when the model changes", async () => {
+  it("downgrades orphaned openai reasoning when the model changes too", async () => {
     const { sessionManager, messages, modelId } = makeSnapshotChangedOpenAIReasoningScenario();
 
     const result = await sanitizeWithOpenAIResponses({