diff --git a/README.md b/README.md
index a983ec6..a4f2244 100644
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+++ b/README.md
@@ -342,6 +342,7 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 * [Hashmaps](https://github.com/goossaert/hashmap) - Implementation of open addressing hash table algorithms in C++. [MIT]
 * [Hopscotch map](https://github.com/Tessil/hopscotch-map) - A fast header-only hash map which uses hopscotch hashing for collisions resolution. [MIT]
 * [LSHBOX](https://github.com/RSIA-LIESMARS-WHU/LSHBOX) - A c++ toolbox of locality-sensitive hashing (LSH), provides several popular LSH algorithms, also support Python and MATLAB. [GPL]
+* [parallel-hashmap](https://github.com/greg7mdp/parallel-hashmap) - A family of header-only, very fast and memory-friendly hashmap and btree containers [Apache2] [website](https://greg7mdp.github.io/parallel-hashmap/)
 * [PGM-index](https://github.com/gvinciguerra/PGM-index) - A data structure that enables fast lookup, predecessor, range searches and updates in arrays of billions of items using orders of magnitude less space than traditional indexes. [Apache2] [website](https://pgm.di.unipi.it)
 * [plf::colony](https://github.com/mattreecebentley/plf_colony) - An unordered "bag"-type container which outperforms std containers in high-modification scenarios while maintaining permanent pointers to non-erased elements regardless of insertion/erasure. [zLib] [website](http://www.plflib.org/colony.htm)
 * [plf::list](https://github.com/mattreecebentley/plf_list) - A std::list implementation which removes range splicing in order to enable cache-friendlier structure, yielding significant performance gains. [zLib] [website](http://www.plflib.org/list.htm)