diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 5586d64d..25451da5 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -233,7 +233,9 @@ namespace {
   };
 
   // Pawn and material hash tables, indexed by the current thread id.
-  // Note that they will be initialized at 0 being global variables.
+  // We use per-thread tables so that once we get a pointer to an entry
+  // its life time is unlimited and we don't have to care about someone
+  // changing the entry under our feet.
   MaterialInfoTable* MaterialTable[MAX_THREADS];
   PawnInfoTable* PawnTable[MAX_THREADS];