diff --git a/README.md b/README.md
index a6ee255..36e7e7a 100644
--- a/README.md
+++ b/README.md
@@ -122,6 +122,8 @@ If you want to use the Allegro backend you can add the build tag `allegro` to th
 ```
 go install opslag.de/schobers/tins2020/cmd/tins2020 -tags static,allegro -ldflags "-s -w"
 ```
+In this case the SDL 2.0 prerequisite is replaced by the Allegro 5.2 (development libraries must be available for your C compiler).
+
 
 ## Sources
 Can be found at https://opslag.de/schobers/tins2020 (Git repository).