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diff --git a/ir/opt/reassoc.h b/ir/opt/reassoc.h
index 72782bfeb..3f15bdd2a 100644
--- a/ir/opt/reassoc.h
+++ b/ir/opt/reassoc.h
@@ -29,6 +29,9 @@
  * and for address expression.
  * Works only if Constant folding is activated.
  *
+ * Uses loop information to detect loop-invariant (ie contant
+ * inside the loop) values.
+ *
  * See Muchnik 12.3.1 Algebraic Simplification and Reassociation of
  * Addressing Expressions.
  *