Update README more.

README.md

@@ -21,26 +21,49 @@ printf("new length: %zu\n", scary_length(a)); //=> 2
 You can push elements with automatic memory extension,
 as much as you want.
 
+Moreover, the `scary_push` function is _generic_ 😱. If you put this code,
+
+```c
+scary_push(&a, 0UL); // Pushing `unsigned long` into an array of `int`!
+```
+
+it will produce a warning by default with modern compilers like GCC 12.
+
+<pre><code><b>warning:</b> passing argument 1 of 'scary_push_uint64' from incompatible pointer type [<b>-Wincompatible-pointer-types</b>]
+    scary_push(<b>&a</b>, 0UL);
+               <b>^~</b>
+               <b>|</b>
+               <b>int **</b>
+</code></pre>
+
+You can of course opt-in an option `-Werror` to prevent such typing mistakes.
+
 And you'll see **magic** here:
 
 ```c
 int i = a[1];
 ```
-You can read/write them as an ordinary C array without any overhead 😱😱.
+You can read/write them as ordinary C arrays with **zero**-overhead 😱😱.
 
 ```c
 printf("content: %d\n", i);
 ```
 Then it prints `42`. Happy ending. 🤔🤔
 
+## Usage
+
+1. `make` and get `libscary.so`.
+2. Write your code with `#include <scary.h>`.
+3. Compile with `-lscary` and proper `-I`/`-L`.
+4. Enjoy your looseness.
+
 ## Development
 
 We use [Criterion](https://github.com/Snaipe/Criterion) for tests so
 you'll need to install that before `make test`.
 
-Dear Debian/Ubuntu users: You can install [its
-package](https://packages.debian.org/bookworm/libcriterion-dev) via
-`apt install libcriterion-dev`.
+Dear Debian/Ubuntu users: You can install its package via
+<code>apt install [libcriterion-dev](https://packages.debian.org/stable/libcriterion-dev)</code>.
 
 ## License