Add information about wasm.

src/content/docs/FAQ/index.mdx

@@ -295,6 +295,11 @@ You can try this:
 
 `compile --reloc=none --target wasm32 -g0 --link-libc=no --no-entry mywasm.c3`
 
+Unless you are compiling with something that already runs initializers,
+you will need to call the function `runtime::wasm_initialize()` early in your
+main *or* call it externally (for example from JS) with the name `_initialize()`,
+otherwise globals might not be set up properly.
+
 This should yield an `out.wasm` file, but there is no CI running on the WASM code
 and no one is really using it yet, so the quality is low.
 
@@ -303,6 +308,7 @@ writing something in WASM - please reach out to the developer team and we'll
 help you get things working.
 
 
+
 **Q:** How do I conditionally compile based on compiler flags?
 
 **A:** You can pass *feature flags* on the command line using `-D SOME_FLAG` or using the `features` key