diff --git a/README.md b/README.md
index a171f45..16cfe15 100644
--- a/README.md
+++ b/README.md
@@ -20,10 +20,21 @@ Every file corrosponds to its respective package.
 
 ### Build Image
 
-* `./makeimage.sh win64 gpl`
+* `./makeimage.sh target variant [addins]`
 
 ### Build FFmpeg
 
-* `./build.sh win64 gpl`
+* `./build.sh target variant [addins]`
 
 On success, the resulting zip file will be in the `artifacts` subdir.
+
+### Targets, Variants and Addins
+
+The two available targets are `win64` and `win32`.
+
+Available in `gpl`, `lgpl`, `gpl-shared` and `lgpl-shared` variants.
+
+All of those can be optionally combined with any combination of addins.
+Currently that's `4.3`, to build from the 4.3 release branch instead of master.
+`vulkan` to add support for (and a hard runtime dependency on) Vulkan.
+`debug` to not strip debug symbols from the binaries. This increases the output size by about 250MB.