diff --git a/src/detection/memory/memory_windows.c b/src/detection/memory/memory_windows.c
index 666d79727..38362fd40 100644
--- a/src/detection/memory/memory_windows.c
+++ b/src/detection/memory/memory_windows.c
@@ -7,6 +7,9 @@ const char* ffDetectMemory(FFMemoryResult* ram)
     MEMORYSTATUSEX statex = {
         .dwLength = sizeof(statex),
     };
+    // GlobalMemoryStatusEx() internally uses
+    // NtQuerySystemInformation(SystemBasicPerformanceInformation) in Win 7, and
+    // NtQuerySystemInformation(SystemMemoryUsageInformation) in Win 10
     if (!GlobalMemoryStatusEx(&statex))
         return "GlobalMemoryStatusEx() failed";