diff --git a/SystemInformation.cxx b/SystemInformation.cxx
index 3e1a1ab80a27c68222bf38a3e33e51cdce771cdb..9f5b78221988d56ae169dd3539be294e22906b07 100644
--- a/SystemInformation.cxx
+++ b/SystemInformation.cxx
@@ -443,7 +443,7 @@ public:
     };
 
 protected:
-  // Functions.
+  // For windows
   bool RetrieveCPUFeatures();
   bool RetrieveCPUIdentity();
   bool RetrieveCPUCacheDetails();
@@ -457,6 +457,7 @@ protected:
   bool RetrieveClassicalCPUIdentity();
   bool RetrieveExtendedCPUIdentity();
 
+  // Processor information
   Manufacturer  ChipManufacturer;
   CPUFeatures   Features;
   ID            ChipID;
@@ -464,11 +465,11 @@ protected:
   unsigned int  NumberOfLogicalCPU;
   unsigned int  NumberOfPhysicalCPU;
 
-  int CPUCount();
+  int CPUCount(); // For windows
   unsigned char LogicalCPUPerPhysicalCPU();
-  unsigned char GetAPICId();
+  unsigned char GetAPICId(); // For windows
   bool IsHyperThreadingSupported();
-  static LongLong GetCyclesDifference(DELAY_FUNC, unsigned int);
+  static LongLong GetCyclesDifference(DELAY_FUNC, unsigned int); // For windows
 
   // For Linux and Cygwin, /proc/cpuinfo formats are slightly different
   bool RetreiveInformationFromCpuInfoFile();