diff --git a/README.md b/README.md
index 0cf73bb..890534d 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ This matrix mirrors the [feature matrix of the OpenFeature SDK for Python](https
 | ✅      | Domains                         | Domains bind clients to providers in the OpenFeature SDK; a separate provider instance may be registered per domain.                                                                                                       |
 | ✅      | Eventing                        | LaunchDarkly data source status changes are emitted as `PROVIDER_READY`, `PROVIDER_STALE` and `PROVIDER_ERROR`, and only when the status changes; flag changes as `PROVIDER_CONFIGURATION_CHANGED` with the changed flag key.                              |
 | ✅      | Tracking                        | `track` sends a LaunchDarkly custom event for the evaluation context, with the tracking event value and remaining details attached.                                                                                        |
-| ✅      | Initialization                  | `initialize` reports whether the LaunchDarkly client became ready. The optional `start_wait` parameter bounds initialization; zero applies no timeout and waits until the data source becomes valid or permanently fails. |
+| ⚠️      | Initialization                  | `initialize` reports whether the LaunchDarkly client became ready. The optional `start_wait` parameter bounds initialization; zero applies no timeout and waits until the data source becomes valid or permanently fails. Since LaunchDarkly Python SDK 9.18.0 a rejected SDK key is retried rather than failing permanently, so zero can wait indefinitely. Provider gap: zero should not wait, [#64](https://github.com/launchdarkly/openfeature-python-server/pull/64). |
 | ✅      | Shutdown                        | `shutdown` closes the LaunchDarkly client; a closed client cannot be restarted, so a new provider instance is required afterward.                                                                                          |
 | ✅      | Transaction Context Propagation | Provided by the OpenFeature SDK, which merges the transaction context into the evaluation context before the provider is called; no provider support is required.                                                          |
 | ✅      | Extending                       | The underlying LaunchDarkly client is available through the `client` property.                                                                                                                                            |
@@ -70,7 +70,7 @@ api.set_provider(openfeature_provider)
 # Refer to OpenFeature documentation for getting a client and performing evaluations.
 ```
 
-The optional `start_wait` parameter is the number of seconds to wait for a successful connection to LaunchDarkly, matching the same parameter of the LaunchDarkly SDK's `LDClient`, and defaulting to the same five seconds. A positive value bounds the whole of initialization: the provider constructor blocks for up to that long, and OpenFeature initialization then completes immediately, reporting a failed initialization if the client did not become ready in time. Zero does not block the constructor at all, and initialization then waits without a deadline for the data source to become valid or to fail permanently.
+The optional `start_wait` parameter is the number of seconds to wait for a successful connection to LaunchDarkly, matching the same parameter of the LaunchDarkly SDK's `LDClient`, and defaulting to the same five seconds. A positive value bounds the whole of initialization: the provider constructor blocks for up to that long, and OpenFeature initialization then completes immediately, reporting a failed initialization if the client did not become ready in time. Zero does not block the constructor at all, and initialization then waits without a deadline for the data source to become valid or to fail permanently. Since LaunchDarkly Python SDK 9.18.0 a rejected SDK key is retried rather than treated as a permanent failure, so with zero, initialization does not complete while the key is rejected.
 
 `api.set_provider` registers the provider without waiting for it to initialize, so the first evaluations may use fallback values while the LaunchDarkly client is still connecting. Use `api.set_provider_and_wait` instead when the application needs registration to block until initialization has succeeded or failed.