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-rw-r--r--src/libexpr/eval.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 456bc25f3278..552b586250b1 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -616,6 +616,9 @@ static char * deepestStack = (char *) -1; /* for measuring stack usage */
 
 Expr evalExpr2(EvalState & state, Expr e)
 {
+    /* When changing this function, make sure that you don't cause a
+       (large) increase in stack consumption! */
+    
     char x;
     if (&x < deepestStack) deepestStack = &x;