docs: add tip on uname -a

README.md

@@ -51,7 +51,7 @@ node            |  |                               |  |
 If you'd rather not install from source, you can download a pre-built binary from the [releases](https://github.com/celestiaorg/celestia-app/releases) page.
 
 1. Navigate to the latest release on <https://github.com/celestiaorg/celestia-app/releases>.
-1. Download the binary for your platform (e.g. `celestia-app_Linux_x86_64.tar.gz`) from the **Assets** section.
+1. Download the binary for your platform (e.g. `celestia-app_Linux_x86_64.tar.gz`) from the **Assets** section. Tip: if you're not sure what platform you're on, you can run `uname -a` and look for the operating system (e.g. `Linux`, `Darin`) and architecture (e.g. `x86_64`, `arm64`).
 1. Extract the archive
 
     ```shell
@@ -69,7 +69,7 @@ If you'd rather not install from source, you can download a pre-built binary fro
 If you use a pre-built binary, you may also want to verify the checksums and signatures.
 
 1. Navigate to the latest release on <https://github.com/celestiaorg/celestia-app/releases>.
-1. Download `checksums.txt`, `checksums.txt.sig`, and the binary for your platform (e.g. `celestia-app_Linux_x86_64.tar.gz`) from the **Assets** section.
+1. Download `checksums.txt`, `checksums.txt.sig`, and the binary for your platform (e.g. `celestia-app_Linux_x86_64.tar.gz`) from the **Assets** section. Tip: if you're not sure what platform you're on, you can run `uname -a` and look for the operating system (e.g. `Linux`, `Darin`) and architecture (e.g. `x86_64`, `arm64`).
 1. Verify the checksums
 
     ```shell