diff --git a/apps/docs/public/intervals_merge-formula.svg b/apps/docs/public/intervals_merge-formula.svg
new file mode 100644
index 0000000..a541aba
--- /dev/null
+++ b/apps/docs/public/intervals_merge-formula.svg
@@ -0,0 +1,29 @@
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+  <rect width="1166" height="466" fill="#f4f5f7"/>
+
+  <!-- Title -->
+  <text x="265" y="50" font-size="28" font-weight="700" fill="#2d3a4a">Merge = [min(starts), max(ends)]</text>
+
+  <!-- Guide lines at the outer edges (merge bounds) -->
+  <line x1="242" y1="115" x2="242" y2="290" stroke="#7f8790" stroke-width="2" stroke-dasharray="6 5"/>
+  <line x1="971" y1="115" x2="971" y2="290" stroke="#7f8790" stroke-width="2" stroke-dasharray="6 5"/>
+
+  <!-- x = [2, 8] -->
+  <text x="238" y="108" font-size="20" fill="#4a5563" font-family="JetBrains Mono, Menlo, Consolas, monospace" text-anchor="middle">2</text>
+  <text x="728" y="108" font-size="20" fill="#4a5563" font-family="JetBrains Mono, Menlo, Consolas, monospace" text-anchor="middle">8</text>
+  <text x="200" y="152" font-size="22" font-weight="600" fill="#3598db" text-anchor="middle">x</text>
+  <rect x="242" y="121" width="486" height="44" rx="6" fill="#3598db"/>
+
+  <!-- y = [5, 11] -->
+  <text x="200" y="218" font-size="22" font-weight="600" fill="#f39c12" text-anchor="middle">y</text>
+  <rect x="485" y="187" width="486" height="44" rx="6" fill="#f39c12"/>
+  <text x="485" y="260" font-size="20" fill="#4a5563" font-family="JetBrains Mono, Menlo, Consolas, monospace" text-anchor="middle">5</text>
+  <text x="966" y="260" font-size="20" fill="#4a5563" font-family="JetBrains Mono, Menlo, Consolas, monospace" text-anchor="middle">11</text>
+
+  <!-- Merged result -->
+  <rect x="242" y="297" width="729" height="22" rx="5" fill="#d5f5e3" stroke="#27ae60" stroke-width="2.5"/>
+  <text x="606" y="358" font-size="22" fill="#27ae60" font-family="JetBrains Mono, Menlo, Consolas, monospace" text-anchor="middle">merge = [2, 11]</text>
+
+  <!-- Worked formula -->
+  <text x="265" y="430" font-size="22" fill="#2d3a4a" font-family="JetBrains Mono, Menlo, Consolas, monospace">min(2, 5) = 2 and max(8, 11) = 11</text>
+</svg>
diff --git a/apps/docs/redirects.ts b/apps/docs/redirects.ts
index 0921ca6..ce8757e 100644
--- a/apps/docs/redirects.ts
+++ b/apps/docs/redirects.ts
@@ -18,6 +18,7 @@ export default [
   { from: "/53", to: "/greedy/maximum-subarray" },
   { from: "/54", to: "/matrix-index-math/spiral-matrix" },
   { from: "/55", to: "/greedy/jump-game" },
+  { from: "/57", to: "/intervals/insert-interval" },
   { from: "/62", to: "/multi-d-grid-dp/unique-paths" },
   { from: "/64", to: "/multi-d-grid-dp/minimum-path-sum" },
   { from: "/70", to: "/1d-dynamic-programming/climbing-stairs" },