diff --git a/README.md b/README.md
index 587a51e..fe1d669 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,12 @@ Tweak framerate or MAX_ERROR in `main.rs` until the total size fits the 16k flas
 
 By default it's tuned for bad apple.
 
+## building ch32_decoder
+If you are not on Linux, good luck.
+
+You will need [ch32v003fun](https://github.com/cnlohr/ch32v003fun/) in next to the folder for this repository.
+
+The `gdbinit` file contains the device path for uploading via a Pi Pico with [PicoRVD](https://github.com/aappleby/PicoRVD). This is triggered with `make flash`.
+
+If you have an official WCH programmer you can probably run `make cv_flash` to use minchlink from ch32v003fun, but I can't test this.
+
diff --git a/encoder/src/main.rs b/encoder/src/main.rs
index c07803c..feeb739 100644
--- a/encoder/src/main.rs
+++ b/encoder/src/main.rs
@@ -63,7 +63,7 @@ fn main() {
 	);
 
 	let mut export_string = String::from("// Generated by the `encoder` rust app\n");
-	export_string += "typedef enum {\n";
+	export_string += "typedef enum Encoding {\n";
 	for (encoding, count) in stats {
 		if count > 0 {
 			export_string += &format!("\tEncoding_{encoding:?} = {},\n", encoding as u8);
@@ -81,7 +81,7 @@ fn main() {
 		export_string += &format!("{byte},");
 	}
 	export_string += "\n};\n";
-	let mut file = File::create("../data.h").unwrap();
+	let mut file = File::create("../ch32_decoder/data.h").unwrap();
 	file.write_all(export_string.as_bytes()).unwrap();
 }