Move make compare to its own build section

INSTALL.md

@@ -418,21 +418,16 @@ If you aren't in the pokeemerald directory already, then **change directory** to
 ```bash
 cd pokeemerald
 ```
-To build **pokeemerald.gba** for the first time and confirm it matches the official ROM image (Note: to speed up builds, see [Parallel builds](#parallel-builds)):
+To build **pokeemerald.gba** (Note: to speed up builds, see [Parallel builds](#parallel-builds)):
 ```bash
-make compare
+make
 ```
-If an OK is returned, then the installation went smoothly.
+If it has built successfully you will have the output file **pokeemerald.gba** in your project folder.
 <details>
 <summary>Note for Windows...</summary>
 > If you switched terminals since the last build (e.g. from msys2 to WSL1), you must run `make clean-tools` once before any subsequent `make` commands.
 </details>
 
-To build **pokeemerald.gba** with your changes:
-```bash
-make
-```
-
 # Building guidance
 
 ## Parallel builds
@@ -451,6 +446,22 @@ Replace `<output of nproc>` with the number that the `nproc` command returned.
 
 `nproc` is not available on macOS. The alternative is `sysctl -n hw.ncpu` ([relevant Stack Overflow thread](https://stackoverflow.com/questions/1715580)).
 
+## Compare ROM to the original
+
+For contributing, or if you'd simply like to verify that your ROM is identical to the original game, run:
+```bash
+make compare
+```
+If it matches, you will see the following at the end of the output:
+```bash
+pokeemerald.gba: OK
+```
+If there are any changes from the original game, you will instead see:
+```bash
+pokeemerald.gba: FAILED
+shasum: WARNING: 1 computed checksum did NOT match
+```
+
 ## devkitARM's C compiler
 
 This project supports the `arm-none-eabi-gcc` compiler included with devkitARM. If devkitARM (a.k.a. gba-dev) has already been installed as part of the platform-specific instructions, simply run: