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diff --git a/README.md b/README.md
index 63b96fe..2838209 100644
--- a/README.md
+++ b/README.md
@@ -233,6 +233,7 @@ Zig Core Language
 * [X] Interfaces
 * [X] Bit manipulation
 * [X] Working with C
+* [ ] Opaque types (anyopaque)
 * [X] Threading
 * [x] Labeled switch
 * [x] Vector operations (SIMD)