diff --git a/README.md b/README.md
index 705ef05..8d1bcd8 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ CG WebP plugin helps you optimize your page load.
 
 When a page is displayed, all images from defined formats are converted to WEBP format and stored in media/plg_system_cgwebp directory or in original images directory.
 
-When images are updated, their webp images is updated as well.
+When images are updated, their webp images is updated as well. Webp images have a version based on original image hash, so, on change, they will be reloaded by web browser.
 
 Storing created images in media directory has the double advantages to easily locate those images and not to double save them (by making media/plg_system_cgwebp an exception in Akeeba Backup)