diff --git a/lib/system.nim b/lib/system.nim
index 9b00ff145208..60892dd94afc 100644
--- a/lib/system.nim
+++ b/lib/system.nim
@@ -2667,8 +2667,11 @@ when not defined(nimscript) and hasAlloc:
       {.warning: "GC_disableMarkAndSweep is a no-op in JavaScript".}
       ""
 
-template accumulateResult*(iter: untyped) =
-  ## helps to convert an iterator to a proc.
+template accumulateResult*(iter: untyped) {.deprecated: "use `sequtils.toSeq` instead (more hygienic, sometimes more efficient)".} =
+  ## helps to convert an iterator to a proc. 
+  ## See also `sequtils.toSeq` which is more hygienic and efficient.
+  ##
+  ## **Deprecated since v0.19.0:** use toSeq instead  
   result = @[]
   for x in iter: add(result, x)