diff --git a/reactos/include/crt/sec_api/search_s.h b/reactos/include/crt/sec_api/search_s.h
index cae89989829..ca48486fe6d 100644
--- a/reactos/include/crt/sec_api/search_s.h
+++ b/reactos/include/crt/sec_api/search_s.h
@@ -3,6 +3,7 @@
  * This file is part of the w64 mingw-runtime package.
  * No warranty is given; refer to the file DISCLAIMER within this package.
  */
+
 #ifndef _INC_SEARCH_S
 #define _INC_SEARCH_S
 
@@ -14,12 +15,34 @@
 extern "C" {
 #endif
 
-  _CRTIMP void *__cdecl _lfind_s(const void *_Key,const void *_Base,unsigned int *_NumOfElements,size_t _SizeOfElements,int (__cdecl *_PtFuncCompare)(void *,const void *,const void *),void *_Context);
-  _CRTIMP void *__cdecl _lsearch_s(const void *_Key,void *_Base,unsigned int *_NumOfElements,size_t _SizeOfElements,int (__cdecl *_PtFuncCompare)(void *,const void *,const void *),void *_Context);
+  _Check_return_
+  _CRTIMP
+  void *
+  __cdecl
+  _lfind_s(
+    _In_ const void *_Key,
+    _In_reads_bytes_((*_NumOfElements) * _SizeOfElements) const void *_Base,
+    _Inout_ unsigned int *_NumOfElements,
+    _In_ size_t _SizeOfElements,
+    _In_ int(__cdecl *_PtFuncCompare)(void *, const void *, const void *),
+    void *_Context);
+
+  _Check_return_
+  _CRTIMP
+  void *
+  __cdecl
+  _lsearch_s(
+    _In_ const void *_Key,
+    _Inout_updates_bytes_((*_NumOfElements) * _SizeOfElements) void *_Base,
+    _Inout_ unsigned int *_NumOfElements,
+    _In_ size_t _SizeOfElements,
+    _In_ int(__cdecl *_PtFuncCompare)(void *, const void *, const void *),
+    void *_Context);
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif
-#endif
+
+#endif /* _INC_SEARCH_S */