diff --git a/REQUIREMENTS.md b/REQUIREMENTS.md
index a63f6e1..c483ca6 100644
--- a/REQUIREMENTS.md
+++ b/REQUIREMENTS.md
@@ -183,7 +183,7 @@ Global exports (`ui::slots::*`, `ui::handles::*`, `ui::components::*`) are opt-i
 ## surface
 
 ### req: surface/001
-001	`hemplate_build` scans `.heml` files and emits `$OUT_DIR/hemplate.surface.postcard` (postcard-encoded, deterministic, versioned).
+001	`hemplate_build` may scan `.heml` files and emit `$OUT_DIR/hemplate.surface.postcard` (postcard-encoded, deterministic, versioned). `slhx_build` may also be called in-process with precomputed hemplate Surface facts or, for simple build scripts, ask hemplate to parse/extract the Surface before slhx interprets it. slhx owns no independent `.heml` parser.
 
 ### req: surface/002
 002	The Surface contains: nodes (NodeId, parent, scope, element, attrs, source span), scopes (ScopeKind: Root | If | Match | Case | For { binding, key_expr }), forms (form controls with raw HTML types), and component uses.
@@ -207,7 +207,7 @@ Global exports (`ui::slots::*`, `ui::handles::*`, `ui::components::*`) are opt-i
 008	The Surface records hemplate structural directives as first-class facts:
 `h-for`, `h-key`, `h-if`, `h-else-if`, `h-else`, `h-match`, `h-case`,
 dynamic `+attr` bindings, and interpolated attr/text expressions. slhx consumes
-these facts; it never parses `.heml` source directly.
+these facts; if a build script points slhx_build at `.heml` files, hemplate still performs parsing and Surface extraction.
 
 ### req: surface/009
 009	Raw/pre-rendered HTML insertions are opaque Surface holes. The parent
@@ -742,7 +742,7 @@ what a valid business email is.
 ## build
 
 ### req: build/001
-001	Build order: `.heml` → `hemplate_build` → `hemplate.surface.postcard` → `slhx_build` → `slhx.generated.rs` + `slhx.syms` + diagnostics.
+001	Build order: `.heml` → hemplate Surface facts (precomputed by `hemplate_build` or extracted in-process by hemplate for `slhx_build`) → `slhx_build` → `slhx.generated.rs` + `slhx.syms` + diagnostics.
 
 ### req: build/002
 002	Proc-macros (`#[slhx::handler]`, `#[slhx::surface]`) are side-effect free. They read generated artifacts (`slhx.syms`, `slhx.generated.rs`) but never parse `.heml`, never process generic Surface IR, and never write files. Global codegen lives only in `build.rs` invoked by `slhx_build`. [north_star]
@@ -801,7 +801,7 @@ Optional ergonomic macros may exist: `#[slhx::surface]`, `#[slhx::component]`,
 002	hemplate never interprets `data-slhx-*` or any other tool-prefixed attributes. It records them faithfully as generic raw attributes in the Surface.
 
 ### req: boundary/003
-003	slhx never parses `.heml` directly. It consumes `hemplate.surface.postcard` emitted by `hemplate_build`. slhx interprets tool-specific conventions (`data-slhx-handle`, `data-slhx-slot`, etc.) from the generic Surface.
+003	slhx never owns `.heml` parsing semantics directly. It consumes hemplate Surface facts, either from `hemplate.surface.postcard` emitted by `hemplate_build` or from in-process hemplate Surface extraction requested by `slhx_build`. slhx interprets tool-specific conventions (`data-slhx-handle`, `data-slhx-slot`, etc.) from the generic Surface.
 
 ---