diff --git a/README.md b/README.md
index 7c32653..871ad11 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # gulp-sharp-optimize-images
 
+Tested and works with gulp `5.0.0` and `4.0.2`.
+
 > Compression and conversion of images for gulp using [sharp](https://www.npmjs.com/package/sharp).
 
 ## What is this