diff --git a/README.md b/README.md
index 9259230..e9b4204 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,7 @@ This crate has zero dependencies.
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    * [Maps](#maps)
    * [Sets](#sets)
+   * [B-tree based maps and sets](#b-tree-based-maps-and-sets)
    * [Vectors without cloning](#vectors-without-cloning)
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