diff --git a/include/mimalloc-types.h b/include/mimalloc-types.h
index a2c3fa9a..12a420c2 100644
--- a/include/mimalloc-types.h
+++ b/include/mimalloc-types.h
@@ -100,7 +100,7 @@ terms of the MIT license. A copy of the license can be found in the file
 // Main tuning parameters for segment and page sizes
 // Sizes for 64-bit, divide by two for 32-bit
 #define MI_SEGMENT_SLICE_SHIFT            (13 + MI_INTPTR_SHIFT)         // 64kb
-#define MI_SEGMENT_SHIFT                  ( 8 + MI_SEGMENT_SLICE_SHIFT)  // 8mb
+#define MI_SEGMENT_SHIFT                  ( 8 + MI_SEGMENT_SLICE_SHIFT)  // 16mb
 
 #define MI_SMALL_PAGE_SHIFT               (MI_SEGMENT_SLICE_SHIFT)       // 64kb
 #define MI_MEDIUM_PAGE_SHIFT              ( 3 + MI_SMALL_PAGE_SHIFT)     // 512kb
diff --git a/src/arena.c b/src/arena.c
index 99eb766c..77616580 100644
--- a/src/arena.c
+++ b/src/arena.c
@@ -127,7 +127,7 @@ static bool mi_arena_alloc(mi_arena_t* arena, size_t blocks, mi_bitmap_index_t*
 /* -----------------------------------------------------------
   Arena cache
 ----------------------------------------------------------- */
-#define MI_CACHE_MAX (128)  // ~4GiB
+#define MI_CACHE_MAX (128) 
 #define MI_MAX_NUMA  (16)
 
 #define MI_SLOT_IN_USE ((void*)1)