diff --git a/wiki/tech/reflect-skip-fuse.md b/wiki/tech/reflect-skip-fuse.md
index eaa61439..c75c4317 100644
--- a/wiki/tech/reflect-skip-fuse.md
+++ b/wiki/tech/reflect-skip-fuse.md
@@ -1,7 +1,7 @@
 ---
 title: Reflect — Skip Fuse (SwiftUI/Kotlin)
 created: '2026-05-23'
-updated: '2026-05-23'
+updated: '2026-05-28'
 type: tech
 namespace: personal
 tags: [reflect, swift, kotlin, ios, android, pitfalls]
@@ -30,3 +30,15 @@ require explicit Kotlin stubs until Skip's transpilation coverage catches up.
 - [ ] Create matching Kotlin stub in `android/src/.../views/`
 - [ ] Register in Android router/factory
 - [ ] Run `./gradlew build` to verify no missing class errors
+
+## `#if SKIP` vs `#if SKIP_BRIDGE` — Definitive Rule
+
+| Macro | When to use |
+|-------|-------------|
+| `#if SKIP` | Any code that runs **only on Android** via Skip (UI layout, Android-only APIs, SAF file access). Works in all Skip-compiled code. |
+| `#if SKIP_BRIDGE` | **Only** for JNI bridge calls: `AnyDynamicObject`, calling Kotlin statics from Swift, `import SkipBridge`. Available only in bridge modules. |
+
+**Rule**: UI buttons, conditional layouts, Android-only views → `#if SKIP`.  
+`AnyDynamicObject(forStaticsOfClassName:)` and JNI → `#if SKIP_BRIDGE`.
+
+Using `#if SKIP_BRIDGE` for UI will silently exclude the code on Android (it's not a bridge module), causing buttons/views to disappear with no error.