Index: src/OFSystemInfo.h
==================================================================
--- src/OFSystemInfo.h
+++ src/OFSystemInfo.h
@@ -101,10 +101,12 @@
 
 /**
  * @brief Returns the number of CPUs installed in the system.
  *
  * A CPU with multiple cores counts as multiple CPUs.
+ *
+ * If the system has no CPU, the return value is undefined.
  *
  * @return The number of CPUs installed in the system
  */
 + (size_t)numberOfCPUs;