diff --git a/rts/Printer.c b/rts/Printer.c
index f4d111189215a7ed6a91fb2143f7ccba584941b5..996199ea52979e00ae98f4757d75efdb4607a1a2 100644
--- a/rts/Printer.c
+++ b/rts/Printer.c
@@ -2,7 +2,8 @@
  *
  * (c) The GHC Team, 1994-2000.
  *
- * Heap printer
+ * Heap printer: This is used for debugging within GDB or for emitting debug
+ * prints.
  *
  * ---------------------------------------------------------------------------*/