diff --git a/include/NtStatus.h b/include/NtStatus.h
index 54f6d4b..e512ee7 100644
--- a/include/NtStatus.h
+++ b/include/NtStatus.h
@@ -47,6 +47,11 @@
 #define STATUS_NO_MEMORY ((NTSTATUS)0xC0000017L)
 #endif
 
+/* A kernel pool or another bounded resource cannot satisfy the request. */
+#ifndef STATUS_INSUFFICIENT_RESOURCES
+#define STATUS_INSUFFICIENT_RESOURCES ((NTSTATUS)0xC000009AL)
+#endif
+
 #ifndef STATUS_ACCESS_DENIED
 #define STATUS_ACCESS_DENIED ((NTSTATUS)0xC0000022L)
 #endif
@@ -79,6 +84,11 @@
 #define STATUS_SHARING_VIOLATION ((NTSTATUS)0xC0000043L)
 #endif
 
+/* The requested object or entity is absent from the queried kernel-owned set. */
+#ifndef STATUS_NOT_FOUND
+#define STATUS_NOT_FOUND ((NTSTATUS)0xC0000225L)
+#endif
+
 // Helper macros
 #ifndef NT_SUCCESS
 #define NT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0)
diff --git a/tests/test_ntstatus.cpp b/tests/test_ntstatus.cpp
new file mode 100644
index 0000000..02b642b
--- /dev/null
+++ b/tests/test_ntstatus.cpp
@@ -0,0 +1,24 @@
+/**
+ * @file test_ntstatus.cpp
+ * @brief Verifies WinKernelLite publishes NTSTATUS values used by shared code.
+ */
+
+#include <gtest/gtest.h>
+
+#include <Windows.h>
+
+#include <WinKernelLite/NtStatus.h>
+
+/** Verifies STATUS_NOT_FOUND retains the exact public WDK bit pattern. */
+TEST(NtStatusContractTest, StatusNotFoundMatchesTheWdkContract) {
+    EXPECT_EQ(
+        static_cast<ULONG>(STATUS_NOT_FOUND),
+        static_cast<ULONG>(0xC0000225UL));
+}
+
+/** Verifies resource-exhaustion failures retain the exact public WDK bits. */
+TEST(NtStatusContractTest, StatusInsufficientResourcesMatchesTheWdkContract) {
+    EXPECT_EQ(
+        static_cast<ULONG>(STATUS_INSUFFICIENT_RESOURCES),
+        static_cast<ULONG>(0xC000009AUL));
+}