diff --git a/source/ona/heap.zig b/source/ona/heap.zig
index 4d32118..b6a28f9 100644
--- a/source/ona/heap.zig
+++ b/source/ona/heap.zig
@@ -7,7 +7,7 @@ const ext = @import("./ext.zig");
 const std = @import("std");
 
 ///
-///
+/// Recorded allocation info state.
 ///
 const AllocationInfo = struct {
 	trace: AllocationTrace,
@@ -16,7 +16,9 @@ const AllocationInfo = struct {
 };
 
 ///
+/// Recorded stack trace of allocation call site.
 ///
+/// *Note* this structure is reduced to zero bytes in released builds optimized for speed or size.
 ///
 const AllocationTrace = std.debug.ConfigurableTrace(2, 4, switch (builtin.mode) {
 	.Debug, .ReleaseSafe => true,
@@ -24,7 +26,7 @@ const AllocationTrace = std.debug.ConfigurableTrace(2, 4, switch (builtin.mode)
 });
 
 ///
-///
+/// Heap allocation context.
 ///
 const Context = struct {
 	allocation_info_head: ?*AllocationInfo = null,
@@ -69,7 +71,7 @@ const Context = struct {
 	}
 
 	///
-	///
+	/// Returns the assumed pointer to the [AllocationInfo] address of `allocation`.
 	///
 	fn allocation_info_of(allocation: [*]u8) *AllocationInfo {
 		return @intToPtr(*AllocationInfo, @ptrToInt(allocation) - @sizeOf(AllocationInfo));
@@ -159,9 +161,12 @@ const Context = struct {
 					if (target_allocation_info == allocation_info_head) {
 						self.allocation_info_head = allocation_info_head.next_info;
 
-						return @ptrCast([*]u8, ext.SDL_realloc(target_allocation_info, size) orelse {
-							return null;
-						})[allocation_info_size .. allocation_info_size + size];
+						const allocation_address = ext.SDL_realloc(target_allocation_info, size) orelse return null;
+
+						target_allocation_info.size = size;
+
+						return @ptrCast([*]u8, allocation_address)[
+							allocation_info_size .. (allocation_info_size + size)];
 					}
 
 					var previous_allocation_info = allocation_info_head;
@@ -171,9 +176,12 @@ const Context = struct {
 						if (allocation_info == target_allocation_info) {
 							previous_allocation_info.next_info = allocation_info.next_info;
 
-							return @ptrCast([*]u8, ext.SDL_realloc(target_allocation_info, size) orelse {
-								return null;
-							})[allocation_info_size .. allocation_info_size + size];
+							const allocation_address = ext.SDL_realloc(target_allocation_info, size) orelse return null;
+
+							target_allocation_info.size = size;
+
+							return @ptrCast([*]u8, allocation_address)[
+								allocation_info_size .. (allocation_info_size + size)];
 						}
 
 						previous_allocation_info = allocation_info;