diff --git a/docs/coverage.svg b/docs/coverage.svg
new file mode 100644
index 00000000..85015663
--- /dev/null
+++ b/docs/coverage.svg
@@ -0,0 +1,17 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="104" height="20">
+  <script/>
+  <linearGradient id="a" x2="0" y2="100%">
+    <stop offset="0" stop-color="#bbb" stop-opacity=".1"/>
+    <stop offset="1" stop-opacity=".1"/>
+  </linearGradient>
+  <rect rx="3" width="104" height="20" fill="#555"/>
+  <rect rx="3" x="64" width="40" height="20" fill="#4fc921"/>
+  <path fill="#4fc921" d="M64 0h4v20h-4z"/>
+  <rect rx="3" width="104" height="20" fill="url(#a)"/>
+  <g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="11">
+    <text x="32" y="15" fill="#010101" fill-opacity=".3">document</text>
+    <text x="32" y="14">document</text>
+    <text x="84" y="15" fill="#010101" fill-opacity=".3">99%</text>
+    <text x="84" y="14">99%</text>
+  </g>
+</svg>