diff --git a/lapis2-docs/astro.config.mjs b/lapis2-docs/astro.config.mjs
index 86e1d6698..2eededebf 100644
--- a/lapis2-docs/astro.config.mjs
+++ b/lapis2-docs/astro.config.mjs
@@ -173,6 +173,15 @@ export default defineConfig({
                                 },
                             ],
                         },
+                        {
+                            label: 'Concepts',
+                            items: [
+                                {
+                                    label: 'Caching',
+                                    link: '/maintainer-docs/concepts/caching',
+                                },
+                            ],
+                        },
                         {
                             label: 'Tutorials',
                             items: [
diff --git a/lapis2-docs/src/components/CacheSizeEndpointLink.astro b/lapis2-docs/src/components/CacheSizeEndpointLink.astro
new file mode 100644
index 000000000..c65f3fda7
--- /dev/null
+++ b/lapis2-docs/src/components/CacheSizeEndpointLink.astro
@@ -0,0 +1,7 @@
+---
+import { getLapisUrl } from '../lapisUrl';
+
+const link = getLapisUrl() + '/actuator/metrics/cache.size';
+---
+
+<a href={link} target='_blank'>{link}</a>
diff --git a/lapis2-docs/src/content/docs/maintainer-docs/concepts/caching.mdx b/lapis2-docs/src/content/docs/maintainer-docs/concepts/caching.mdx
new file mode 100644
index 000000000..87f6362fd
--- /dev/null
+++ b/lapis2-docs/src/content/docs/maintainer-docs/concepts/caching.mdx
@@ -0,0 +1,17 @@
+---
+title: Caching
+description: LAPIS' caching concept
+---
+
+import CacheSizeEndpointLink from '../../../../components/CacheSizeEndpointLink.astro';
+
+LAPIS uses Spring Boot's caching capabilities to cache insertion and mutation queries.
+We decided to cache SILO actions that are relatively expensive to compute,
+but don't return much data (measured in size of the response body).
+
+At the time of writing, we think that aggregated queries are fast enough to not require caching.
+Details and FASTA actions are more expensive, but return potentially large amounts of data.
+
+LAPIS offers an endpoint to check the current cache size (in number of cached entries) at `/actuator/metrics/cache.size`:
+
+<CacheSizeEndpointLink />
diff --git a/lapis2-docs/tests/docs.spec.ts b/lapis2-docs/tests/docs.spec.ts
index 7010773e7..393cbe42c 100644
--- a/lapis2-docs/tests/docs.spec.ts
+++ b/lapis2-docs/tests/docs.spec.ts
@@ -87,6 +87,7 @@ const maintainerDocsPages = prependToRelativeUrl(
             ],
             '/references',
         ),
+        ...prependToRelativeUrl([{ title: 'Caching', relativeUrl: '/caching' }], '/concepts'),
         ...prependToRelativeUrl(
             [
                 { title: 'Start LAPIS and SILO', relativeUrl: '/start-lapis-and-silo' },