diff --git a/crates/fj-viewer/Cargo.toml b/crates/fj-viewer/Cargo.toml
index fc86b1506..80e243430 100644
--- a/crates/fj-viewer/Cargo.toml
+++ b/crates/fj-viewer/Cargo.toml
@@ -38,8 +38,13 @@ features = ["png", "jpeg"]
 version = "25.0.0"
 features = ["webgl"]
 
-# We don't depend on `getrandom` directly, but we need this to enable the `js`
-# feature when cross-compiling to WASM. Otherwise, `getrandom` will not build.
+# We don't depend on `getrandom` directly, but we need this to enable the
+# `wasm_js` feature when cross-compiling to WASM. Otherwise, `getrandom` will
+# not build.
+#
+# Please note that this alone is not enough to make this workaround work. To
+# make the selected backend available, `--cfg` flag needs to be passed to rustc.
+# We do this in `tools/cross-compiler/src/main.rs`.
 [target.'cfg(target_arch = "wasm32")'.dependencies.getrandom]
 version = "0.3.2"
 features = ["wasm_js"]