diff --git a/index.html b/index.html
index 9c7f6aa..cd707e8 100644
--- a/index.html
+++ b/index.html
@@ -6,15 +6,15 @@
   <link rel="icon" type="image/svg+xml" href="/totp.svg"/>
   <link rel="shortcut icon" href="/favicon.ico"/>
   <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png"/>
-  <meta name="apple-mobile-web-app-title" content="TOTP.lol"/>
+  <meta name="apple-mobile-web-app-title" content="TOTP.fyi"/>
   <link rel="manifest" href="/site.webmanifest"/>
   <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
-  <title>TOTP.lol — A TOTP Code Generator for Developers</title>
+  <title>TOTP.fyi — A TOTP Code Generator for Developers</title>
 </head>
 <body>
 <nav class="navbar navbar-expand-lg">
   <div class="container">
-    <a class="navbar-brand" href="#">TOTP.lol</a>
+    <a class="navbar-brand" href="#">TOTP.fyi</a>
     <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent"
             aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
       <span class="navbar-toggler-icon"></span>
@@ -27,6 +27,9 @@
         <li class="nav-item">
           <a class="nav-link" href="#how-to-use">How to use?</a>
         </li>
+        <li class="nav-item">
+          <a class="nav-link" href="#how-does-it-work">How does it work?</a>
+        </li>
         <li class="nav-item">
           <a class="nav-link" href="#support-me">Support me</a>
         </li>
@@ -85,6 +88,50 @@
         directly to a certain configuration.</p>
     </div>
   </div>
+  <div class="card">
+    <div class="card-body">
+      <h3 class="card-title" id="how-does-it-work">How does TOTP work?</h3>
+      <p class="card-text">Time-based one-time password (TOTP), defined in <a
+        href="https://datatracker.ietf.org/doc/html/rfc6238">RFC 6238</a>, is based on the HMAC-based one-time password
+        (HOTP) algorithm, which uses the common HMAC construction based on the current time. TOTP requires the following
+        inputs:
+      </p>
+      <ul class="card-text">
+        <li>The cryptographic hash function <var>H</var>, which defaults to SHA-1. This is configurable in the advanced
+          settings;
+        </li>
+        <li>The secret key <var>K</var>, which is commonly encoded as Base32. This value, encoded in Base32, is what you
+          enter into the <strong>secret key</strong> field;
+        </li>
+        <li>The time window <var>X</var>, which is how long each code is valid for;</li>
+        <li>The epoch <var>T<sub>0</sub></var>, which is the Unix epoch (0 in Unix time) in every known implementation,
+          but could be changed; and
+        </li>
+        <li>The number of digits <var>d</var>, which is the length of the final output code in decimal digits.</li>
+      </ul>
+      <p class="card-text">The algorithm is as follows:</p>
+      <ol class="card-text">
+        <li>Take the current unix time <var>U</var>;</li>
+        <li>Compute the time step count
+          <img class="math" src="math/t.svg" alt="T=\left\lfloor\frac{U - T_0}{X}\right\rfloor" height="40">;
+        </li>
+        <li>Compute the HMAC <img class="math" src="math/h.svg" alt="h = \text{HMAC}_H(K, T)" height="18">;</li>
+        <li>Extract the 4 lowest order bits, i.e. the 4 least significant bits from the last byte of <var>h</var>, to
+          create the integer <var>i</var>;
+        </li>
+        <li>Take four bytes from <var>h</var> starting at <var>i</var>, i.e. bytes [<var>i</var>, <var>i</var>+4), mask
+          off the most significant bit (to support signed arithmetic), and use it to create the integer <var>y</var>;
+          and finally
+        </li>
+        <li>Compute the code as <img class="math" src="math/mod.svg" alt="y \bmod{10^d}" height="18"
+                                     style="vertical-align: -3px">.
+        </li>
+      </ol>
+      <p class="card-text">To avoid clock synchronization issues, most implementations will accept TOTP codes from the
+        window before and after the one based on the current time. This tool lets you see the previous and next codes to
+        help you debug.</p>
+    </div>
+  </div>
   <div class="card">
     <div class="card-body">
       <h3 class="card-title" id="support-me">I like this website. How can I support you?</h3>
diff --git a/math/h.svg b/math/h.svg
new file mode 100644
index 0000000..b5d1cc3
--- /dev/null
+++ b/math/h.svg
@@ -0,0 +1 @@
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diff --git a/math/mod.svg b/math/mod.svg
new file mode 100644
index 0000000..2f5f1f5
--- /dev/null
+++ b/math/mod.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" viewBox="0 -903.7 4385.3 1108.7"><defs><path id="a" d="M21 287q0 14 15 48t48 71 74 36q41 0 66-23t26-64q-2-19-3-21 0-3-16-46t-33-97-16-86q0-43 14-60t42-18q23 0 43 11t31 23 27 33q0 1 5 20t14 59 19 74q38 150 42 157 13 27 43 27 13 0 21-7t11-12 2-9q0-13-49-210T391-23q-28-83-97-132t-138-50q-45 0-79 22t-34 66q0 22 7 37t19 22 20 10 17 3q44 0 44-42 0-20-12-35t-23-20-13-5l-3-1q2-5 19-12t34-7h8q17 0 26 2 33 9 61 38t43 62 23 56 8 30l-6-4q-6-4-19-11T270-6q-20-5-39-5-46 0-81 22t-46 71q-1 7-1 31 0 57 35 149t35 117v14q0 3-4 7t-11 4h-4q-23 0-42-19t-30-41-17-42-8-22q-2-2-16-2H27q-6 6-6 9Z"/><path id="b" d="M41 46h14q39 0 47 14v62q0 17 1 39t0 42v66q0 35-1 59v23q-3 19-14 25t-45 9H25v23q0 23 2 23l10 1q10 1 28 2t37 2l36 2q19 1 29 3t11 1h3v-40q0-38 1-38t5 5 12 15 19 18 29 19 38 16q20 5 51 5 15 0 28-2t23-6 19-8 15-9 11-11 9-11 7-11 4-10 3-8l2-5 3 4 6 8q3 4 9 11t13 13 15 13 20 12 23 10 26 7 31 3q126 0 137-113 1-7 1-139v-86q0-38 2-45t11-10q21-3 49-3h16V0h-8l-23 1q-24 1-51 1t-38 1Q596 3 587 0h-8v46h16q61 0 61 16 1 2 1 138-1 135-2 143-6 28-20 42t-24 17-26 2q-45 0-79-34-27-27-34-55t-8-83V108q0-30 1-40t3-13 9-6q21-3 49-3h16V0h-8l-24 1q-23 1-50 1t-38 1Q319 3 310 0h-8v46h16q61 0 61 16 1 2 1 138-1 135-2 143-6 28-20 42t-24 17-26 2q-45 0-79-34-27-27-34-55t-8-83V108q0-30 1-40t3-13 9-6q21-3 49-3h16V0h-8l-23 1q-24 1-51 1t-38 1Q42 3 33 0h-8v46h16Z"/><path id="c" d="M28 214q0 95 65 164t157 70q90 0 155-68t66-165q0-95-64-160T250-10q-97 0-159 67T28 214ZM250 30q122 0 122 163v57q0 22-1 38t-7 38-16 36-31 28-49 20q-5 1-16 1-30 0-57-12-43-22-56-61t-13-92v-20q0-96 19-135 32-61 105-61Z"/><path id="d" d="M376 495v40q0 24 1 33 0 45-10 56t-51 13h-18v23q0 23 2 23l10 1q10 1 29 2t37 2l37 2q20 1 30 3t11 1h3V390q0-306 1-309 3-20 14-26t45-9h18V0q-2 0-76-5t-79-6h-7v55l-8-7q-58-48-130-48-77 0-139 61T34 215q0 100 63 163t147 64q75 0 132-49v102Zm-3-153q-45 63-113 63-49 0-87-36-27-28-34-64t-8-94q0-56 7-91t35-61q30-33 78-33 71 0 122 77v239Z"/><path id="e" d="m213 578-13-5q-14-5-40-10t-58-7H83v46h19q47 2 87 15t56 24 28 22q2 3 12 3 9 0 17-6V361l1-300q7-7 12-9t24-4 62-2h26V0h-11q-21 3-159 3-136 0-157-3H88v46h64q16 0 25 1t16 3 8 2 6 5 6 4v517Z"/><path id="f" d="M96 585q56 81 153 81 48 0 96-26t78-92q37-83 37-228 0-155-43-237-20-42-55-67t-61-31-51-7q-26 0-52 6t-61 32-55 67q-43 82-43 237 0 174 57 265Zm225 12q-30 32-71 32-42 0-72-32-25-26-33-72t-8-192q0-158 8-208t36-79q28-30 69-30 40 0 68 30 29 30 36 84t8 203q0 145-8 191t-33 73Z"/><path id="g" d="m366 683 72 5q71 5 73 6 12 0 12-8 0-7-73-302T375 83t-1-15q0-42 28-42 9 1 20 9 21 20 41 96 6 20 10 21 2 1 10 1h8q15 0 15-8 0-5-3-16-13-50-30-81T445 8 417-8q-8-2-24-2-34 0-57 15t-30 31l-6 15q-1 1-4-1l-4-4q-59-56-120-56-55 0-97 40T33 157q0 48 20 98t48 86q47 57 94 79t85 22q56 0 84-42 5-6 5-4l27 109q26 105 28 111 0 13-7 16t-39 5h-21q-6 6-6 8t2 19q5 19 13 19Zm-14-357q-23 79-75 79-35 0-67-31t-50-81q-29-79-41-164v-11q0-8-1-12 0-45 18-62t43-18q54 0 111 72l8 11 54 217Z"/></defs><g stroke="#000" stroke-width="0"><use xlink:href="#a" transform="scale(1 -1)"/><g transform="matrix(1 0 0 -1 767.8 0)"><use xlink:href="#b"/><use xlink:href="#c" transform="translate(833)"/><use xlink:href="#d" transform="translate(1333)"/></g><g><g><g transform="matrix(1 0 0 -1 2934.6 0)"><use xlink:href="#e"/><use xlink:href="#f" transform="translate(500)"/></g><use xlink:href="#g" transform="matrix(.7 0 0 -.7 3967.6 -413)"/></g></g></g></svg>
\ No newline at end of file
diff --git a/math/t.svg b/math/t.svg
new file mode 100644
index 0000000..e9a074d
--- /dev/null
+++ b/math/t.svg
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/site.webmanifest b/site.webmanifest
index 8cde777..426910b 100644
--- a/site.webmanifest
+++ b/site.webmanifest
@@ -1,5 +1,5 @@
 {
-  "name": "TOTP.lol",
+  "name": "TOTP.fyi",
   "short_name": "TOTP",
   "icons": [
     {
