diff --git a/README.md b/README.md
index e6a3478..bd0d065 100644
--- a/README.md
+++ b/README.md
@@ -136,6 +136,7 @@ v0.5.2 (2014-04-01)
 * Correcting issue #26 providing error message when not using postprocessing.
 * Correcting issue #27 warning of default timezone.
 * Removed default $config options in `img.php`, was not used, all configuration should be in `img_config.php`.
+* Verified known bug - sharpen acts as blur in PHP 5.5.9 and 5.5.10 #28
 
 
 v0.5.1 (2014-02-12)