diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index 658b96f..80c20e4 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -37,6 +37,8 @@
 - [Traits](./traits.md)
   - [Essential Traits](./essential-traits.md)
   - [Automatic Derivation](./automatic-derivation.md)
+  - [Associated Types](./associated-types.md)
+  - [Associated Effects](./associated-effects.md)
   - [Higher-Kinded Types](./higher-kinded-types.md)
 - [Effects and Handlers](./effects-and-handlers.md)
 - [Laziness](./laziness.md)
diff --git a/src/associated-effects.md b/src/associated-effects.md
new file mode 100644
index 0000000..ecbf7bc
--- /dev/null
+++ b/src/associated-effects.md
@@ -0,0 +1,6 @@
+## Associated Effects
+
+> **Warning:** Associated effects are an experimental feature. 
+
+> **Warning:** Associated effects have not yet been released and are only
+> available on nightly builds. 
diff --git a/src/associated-types.md b/src/associated-types.md
new file mode 100644
index 0000000..2770626
--- /dev/null
+++ b/src/associated-types.md
@@ -0,0 +1,7 @@
+## Associated Types
+
+> **Warning:** Associated types are an experimental feature. 
+
+> **Warning:** Associated types have not yet been released and are only
+> available on nightly builds. 
+
diff --git a/src/traits.md b/src/traits.md
index fb773ad..4c58c89 100644
--- a/src/traits.md
+++ b/src/traits.md
@@ -4,6 +4,8 @@ Traits (also known as _type classes_) support abstraction and overloading. At a
 first-glance, the trait system in Flix is similar to that of Haskell and Rust,
 with some more important differences.
 
+<div style="color:gray">
+
 ## Essentials
 
 The function `isSingleton` naively determines whether
@@ -193,3 +195,5 @@ instance Primitive[Int32]
 instance Primitive[Float64]
 // ... and so on
 ```
+
+</div>
\ No newline at end of file