diff --git a/docs/changelog.md b/docs/changelog.md
index ab5c4d37a..0d03a6184 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -24,6 +24,10 @@ Requires libvips v8.15.2
   [#4157](https://github.com/lovell/sharp/pull/4157)
   [@nkeynes](https://github.com/nkeynes)
 
+* Expose optional `precision` parameter of `blur` operation.
+  [#4168](https://github.com/lovell/sharp/pull/4168)
+  [@marcosc90](https://github.com/marcosc90)
+
 ### v0.33.4 - 16th May 2024
 
 * Remove experimental status from `pipelineColourspace`.
diff --git a/docs/humans.txt b/docs/humans.txt
index 489e4a886..3c027a041 100644
--- a/docs/humans.txt
+++ b/docs/humans.txt
@@ -302,3 +302,6 @@ GitHub: https://github.com/ton11797
 
 Name: Nathan Keynes
 GitHub: https://github.com/nkeynes
+
+Name: Marcos Casagrande
+GitHub: https://github.com/marcosc90
diff --git a/test/types/sharp.test-d.ts b/test/types/sharp.test-d.ts
index e5eea4427..3e6902cfb 100644
--- a/test/types/sharp.test-d.ts
+++ b/test/types/sharp.test-d.ts
@@ -59,6 +59,11 @@ sharp('input.jpg')
 
 sharp('input.jpg').resize({ width: 300 }).blur(false).blur(true).toFile('output.jpg');
 
+sharp().blur();
+sharp().blur(1);
+sharp().blur({ sigma: 1 });
+sharp().blur({ sigma: 1, precision: 'approximate' });
+
 sharp({
   create: {
     width: 300,