diff --git a/README.md b/README.md
index d37016d..fa96450 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ Texture atlas creator tool for Unity. <br> This tool is made to combine textures
 ### Unity versions
 - Latest release requires Unity 2018.3 or higher.
 - Releases before 1.8 should work with older Unity versions.
+- Upgrading to 1.8+ will break existing atlasses.
 
 ## Export options
 ### Meshes