diff --git a/src/libfetchers/cache.hh b/src/libfetchers/cache.hh
index b517d496e..c8d3248bc 100644
--- a/src/libfetchers/cache.hh
+++ b/src/libfetchers/cache.hh
@@ -6,13 +6,14 @@
 
 namespace nix::fetchers {
 
+/*
+ * A cache for arbitrary `Attrs` -> `Attrs` mappings with a timestamp
+ * for expiration.
+ */
 struct Cache
 {
     virtual ~Cache() { }
 
-    /* A cache for arbitrary Attrs -> Attrs mappings with a timestamp
-       for expiration. */
-
     /*
      * Add a value to the cache. The cache is an arbitrary mapping of
      * Attrs to Attrs.