diff --git a/README.md b/README.md
index 411f8a0..e97f7dc 100644
--- a/README.md
+++ b/README.md
@@ -109,7 +109,8 @@ The following dependent crates provide platform-agnostic device drivers built on
 - `log`: Disabled by default. Enable log statements on various log levels to aid debugging. Powered by `log`.
 - `defmt`: Disabled by default. Enable defmt log statements on various log levels to aid debugging. Powered by `defmt`.
 - `custom-error-messages`: Disabled by default. Allows errors to contain custom error messages up to 64 characters, parsed by `AtDigest::custom_error`.
-- `hex_str_arrays`: Disabled by default. Needs `#![feature(generic_const_exprs)]` Nightly feature. This allows for hex strings to be serialized to a fix-width byte array. 
+- `hex_str_arrays`: Disabled by default. Needs `#![feature(generic_const_exprs)]` Nightly feature. This allows for hex strings to be serialized to a fix-width byte array.
+- `heapless`: Enable heapless feature on `serde_at`. This enables heapless support and adds some specialized parsing structs.
 
 ## Chat / Getting Help
 
diff --git a/atat/Cargo.toml b/atat/Cargo.toml
index 2b2fe55..138523f 100644
--- a/atat/Cargo.toml
+++ b/atat/Cargo.toml
@@ -52,3 +52,4 @@ bytes = ["heapless-bytes", "serde_bytes"]
 custom-error-messages = []
 std = ["serde_at/std", "nom/std", "embassy-time/std", "embedded-io/std"]
 hex_str_arrays = []
+heapless = ["serde_at/heapless"]