diff --git a/fancy_toys.jl b/fancy_toys.jl
index e71dd6ca2ef..b0ee1241149 100644
--- a/fancy_toys.jl
+++ b/fancy_toys.jl
@@ -14,6 +14,9 @@ Return whether the tarballs for the given `platform` should be built.
 This is useful when the builder has different platform-dependent elements
 (sources, script, products, etc...) that make it hard to have a single
 `build_tarballs` call.
+
+Note that the platform must be augmented, e.g. wrt. CUDA, if the platform
+supplied in ARGS is augmented.
 """
 function should_build_platform(platform)
     # If you need inspiration for how to use this function, look at the builder