diff --git a/release-notes.md b/release-notes.md
index 52d58927..e09c5856 100644
--- a/release-notes.md
+++ b/release-notes.md
@@ -19,14 +19,48 @@ This is version 1.6 of the OpenFX API.
 
 ## Fixes in OpenFX Version 1.6:
 
+## Deprecations
+
+## Detailed List of Changes
+
+# Release Notes - 1.5.1
+
+This is version 1.5.1 of the OpenFX API, a minor release with bug fixes and improvements.
+
+## Key Features of OpenFX Version 1.5.1:
+
+- **CPU Render Support**: Added `kOfxImageEffectPropCPURenderSupported` property to allow plugins to declare CPU rendering capability (or rather lack thereof).
+- **Thumbnail Rendering**: Added `kOfxImageEffectPropThumbnailRender` property to support efficient thumbnail generation.
+- **Spatial Awareness**: Added `kOfxImageEffectPropNoSpatialAwareness`. Allows the host and plugin to coordinate a render that ensures no spatial changes to the image.
+
+
+## Fixes in OpenFX Version 1.5.1:
+
+- Fix LICENSE.md to conform to Github template for BSD 3-Clause (issue #194).
+- Use predefined `_WIN32` macro everywhere instead of defining `WINDOWS`, improving Windows portability.
+- Fix CI build problems with conan version, expat dependency, and compiler compatibility.
+- Restore older CentOS 7 builds for vfx-2021 & 2022 compatibility.
 - Clarify that Image Effect Hosts property `kOfxPropType` must have the value
   `kOfxTypeImageEffectHost`, and fix host support lib to implement that.
 
+## Documentation Improvements
+
+- Significantly cleaned up documentation for Interacts, including DrawSuite and Overlay Interacts interaction.
+- Fixed documentation for `clipGetRegionOfDefinition`.
+- Updated colourspace example for more complete coverage.
+- Fixed numerous typos throughout Documentation, include, Support, and HostSupport directories (via codespell).
+- Corrected copyright notice with explanation in CONTRIBUTING.md (addresses issues #110, #206).
+- Updated documentation footer and build script to support `uv` package manager.
+- Removed stray references to old OFX Association.
+
 ## Deprecations
 
+None
+
 ## Detailed List of Changes
 
-- Add `kOfxImageEffectPropNoSpatialAwareness`. Allows the host and plugin to coordinate a render that ensures no spatial changes to the image.
+- Add `kOfxImageEffectPropCPURenderSupported` (issue #212) - Property to indicate CPU rendering support.
+- Add `kOfxImageEffectPropThumbnailRender` (issue #193) - Property for thumbnail rendering mode.
 
 # Release Notes - 1.5
 
@@ -104,7 +138,7 @@ ofxParam.h:
 * removed - kOfxParamDoubleTypeNormalisedXYAbsolute
 * modified - kOfxParamPropInteractMinimumSize is now a double (matches kOfxParamPropInteractSize)
 * modified - changed comments with regards to OfxParameterSuiteV1 (i.e. no Analysis action anymore)
-* refined - paramGetValue, paramSetValue: precision about when it's safe to use - i.e. Instance Changed domain only)
+* refined - paramGetValue, paramSetValue: precision about when it's safe to use - i.e. Instance Changed domain only
 
 ofxPixels.h: