diff --git a/README.md b/README.md
index b94e077..ddb5894 100644
--- a/README.md
+++ b/README.md
@@ -683,6 +683,7 @@ array expressions, inspired by NumPy syntax. [BSD 3-clause] [website](http://qua
 * [cppcodec](https://github.com/tplgy/cppcodec) - Header-only C++11 library to encode/decode base64, base32 and hex with consistent, flexible API. [MIT]
 * [FlatBuffers](https://github.com/google/flatbuffers) - A Memory efficient serialization library. [Apache2]
 * [MessagePack](https://github.com/msgpack/msgpack-c) - Efficient binary serialization format "like JSON" for C and C++. [Apache2] [website](http://msgpack.org/)
+* [nanopb](https://github.com/nanopb/nanopb) - Small code-size Protocol Buffers implementation in ANSI C. [Zlib]
 * [protobuf](https://github.com/google/protobuf) - Protocol Buffers - Google's data interchange format. [BSD]
 * [protobuf-c](https://github.com/protobuf-c/protobuf-c) - Protocol Buffers implementation in C. [BSD]
 * [SimpleBinaryEncoding](https://github.com/real-logic/simple-binary-encoding) - encoding and decoding application messages in binary format for low-latency applications. [Apache2]