diff --git a/pageserver/src/page_cache.rs b/pageserver/src/page_cache.rs
index fb1c5fc485..9cc1bf35dc 100644
--- a/pageserver/src/page_cache.rs
+++ b/pageserver/src/page_cache.rs
@@ -799,8 +799,9 @@ impl PageCache {
     fn new(num_pages: usize) -> Self {
         assert!(num_pages > 0, "page cache size must be > 0");
 
-        // We use Box::leak here and into_boxed_slice to avoid leaking uninitialized
-        // memory that Vec's might contain.
+        // We could use Vec::leak here, but that potentially also leaks
+        // uninitialized reserved capacity. With into_boxed_slice and Box::leak
+        // this is avoided.
         let page_buffer = Box::leak(vec![0u8; num_pages * PAGE_SZ].into_boxed_slice());
 
         let size_metrics = &crate::metrics::PAGE_CACHE_SIZE;