diff --git a/recipes/wip/games/rbdoom3-bfg/recipe.toml b/recipes/wip/games/rbdoom3-bfg/recipe.toml
index 6e17d3ec3d2e043f5741ea14ce120ac192401a5c..620794db6b6ec0b19b2c2b2885dfe6faddddada1 100644
--- a/recipes/wip/games/rbdoom3-bfg/recipe.toml
+++ b/recipes/wip/games/rbdoom3-bfg/recipe.toml
@@ -1,4 +1,5 @@
 #TODO missing script for CMake, see https://github.com/RobertBeckebans/RBDOOM-3-BFG#compiling-on-linux-
+#TODO require the Vulkan SDK, see https://vulkan.lunarg.com/
 [source]
 git = "https://github.com/RobertBeckebans/RBDOOM-3-BFG"
 rev = "39ae1202b4e61ccb8d8e59609f5cd62b04a62a58"