diff --git a/README.md b/README.md
index ab147b90..cf3e6b98 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@ Main library [![Crates.io](https://img.shields.io/crates/v/miniz_oxide.svg)](htt
 C API [![Crates.io](https://img.shields.io/crates/v/miniz_oxide_c_api.svg)](https://crates.io/crates/miniz_oxide_c_api)[![Docs](https://docs.rs/miniz_oxide_c_api/badge.svg)](https://docs.rs/miniz_oxide_c_api)
 
 # miniz_oxide
-Pure rust Rust replacement for the [miniz](https://github.com/richgel999/miniz) deflate/zlib encoder/decoder using no unsafe code.
+Pure rust Rust replacement for the [miniz](https://github.com/richgel999/miniz) deflate/zlib encoder/decoder using no unsafe code. Builds in [no_std](https://docs.rust-embedded.org/book/intro/no-std.html) mode, though requires the use of `alloc` and `collections` crates.
 
 This project is organized into a C API shell and a rust crate.
 The Rust crate is found in the [miniz_oxide subdirectory](https://github.com/Frommi/miniz_oxide/tree/master/miniz_oxide).
diff --git a/miniz_oxide/Readme.md b/miniz_oxide/Readme.md
index 59119a34..5934d85c 100644
--- a/miniz_oxide/Readme.md
+++ b/miniz_oxide/Readme.md
@@ -3,6 +3,8 @@
 A fully safe, pure rust replacement for the [miniz](https://github.com/richgel999/miniz) DEFLATE/zlib encoder/decoder.
 The main intention of this crate is to be used as a back-end for the [flate2](https://github.com/alexcrichton/flate2-rs), but it can also be used on it's own. Using flate2 with the ```rust_backend``` feature provides an easy to use streaming API for miniz_oxide.
 
+The library is fully [no_std](https://docs.rust-embedded.org/book/intro/no-std.html), though it requires the use of the `alloc` and `collection` crates as it allocates memory.
+
 miniz_oxide 0.5.x Requires at least rust 1.40.0 0.3.x requires at least rust 0.36.0.
 
 miniz_oxide features no use of unsafe code.