diff --git a/reactos/include/ndk/pstypes.h b/reactos/include/ndk/pstypes.h
index 964b658ec99..b4b1e717963 100644
--- a/reactos/include/ndk/pstypes.h
+++ b/reactos/include/ndk/pstypes.h
@@ -1160,8 +1160,8 @@ typedef struct _EPROCESS
     EX_RUNDOWN_REF RundownProtect;
     HANDLE UniqueProcessId;
     LIST_ENTRY ActiveProcessLinks;
-    ULONG QuotaUsage[3];
-    ULONG QuotaPeak[3];
+    ULONG QuotaUsage[3]; /* 0=PagedPool, 1=NonPagedPool, 2=Pagefile */
+    ULONG QuotaPeak[3];  /* ditto */
     ULONG CommitCharge;
     ULONG PeakVirtualSize;
     ULONG VirtualSize;