diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 2b878682..c01949a9 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.508.0"
+  ".": "0.509.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index bb449d9e..94c70be4 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 238
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase/increase-c2a96dbb3b2b8f8b770122d20d9a18c6f53712c5b69f26551d45fbb320ed4351.yml
-openapi_spec_hash: 2a0f520c0a49a415df945eb33d8a707c
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase/increase-7b70c044f69ec392a05ec3df7d46b433fe66a94f66535c0e7558928edb7d1a06.yml
+openapi_spec_hash: 94a7198ec08ed56bbffed8d2184eff8b
 config_hash: 060e036e1db198f2e908364c9df7096e
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4f45b3a1..d14c8e69 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.509.0 (2026-05-01)
+
+Full Changelog: [v0.508.0...v0.509.0](https://github.com/Increase/increase-python/compare/v0.508.0...v0.509.0)
+
+### Features
+
+* **api:** api update ([ee01358](https://github.com/Increase/increase-python/commit/ee01358f9452ac439033d2335c96395ca71b82e2))
+
 ## 0.508.0 (2026-05-01)
 
 Full Changelog: [v0.507.0...v0.508.0](https://github.com/Increase/increase-python/compare/v0.507.0...v0.508.0)
diff --git a/pyproject.toml b/pyproject.toml
index 93c8df69..0304327e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "increase"
-version = "0.508.0"
+version = "0.509.0"
 description = "The official Python library for the increase API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/increase/_version.py b/src/increase/_version.py
index a6e99ed2..786fa6c7 100644
--- a/src/increase/_version.py
+++ b/src/increase/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "increase"
-__version__ = "0.508.0"  # x-release-please-version
+__version__ = "0.509.0"  # x-release-please-version
diff --git a/src/increase/types/ach_transfer_create_params.py b/src/increase/types/ach_transfer_create_params.py
index 2b795a73..50aded52 100644
--- a/src/increase/types/ach_transfer_create_params.py
+++ b/src/increase/types/ach_transfer_create_params.py
@@ -174,10 +174,8 @@ class AddendaFreeform(TypedDict, total=False):
     entries: Required[Iterable[AddendaFreeformEntry]]
     """Each entry represents an addendum sent with the transfer.
 
-    In general, you should send at most one addendum–most ACH recipients cannot
-    access beyond the first 80 characters sent. Please reach out to
-    [support@increase.com](mailto:support@increase.com) to send 2 or more addenda to
-    a recipient expecting a specific addendum format.
+    Sending more than one addendum is only supported for transfers with
+    `standard_entry_class_code` of `corporate_trade_exchange` (CTX).
     """