diff --git a/changelog.md b/changelog.md
index 356ee9263..6bd3c99e3 100644
--- a/changelog.md
+++ b/changelog.md
@@ -11,6 +11,8 @@
   or define your own `Math.trunc` polyfill using the [`emit` pragma](https://nim-lang.org/docs/manual.html#implementation-specific-pragmas-emit-pragma). Nim uses
   `Math.trunc` for the division and modulo operators for integers.
 
+- Deprecated `std/sums`.
+
 - Optional parameters in combination with `: body` syntax (RFC #405) are now opt-in via
   `experimental:flexibleOptionalParams`.
 
diff --git a/lib/std/sums.nim b/lib/std/sums.nim
index b68858ef7..a6ce1b85d 100644
--- a/lib/std/sums.nim
+++ b/lib/std/sums.nim
@@ -8,6 +8,8 @@
 
 ## Accurate summation functions.
 
+{.deprecated: "use the nimble package `sums` instead.".}
+
 runnableExamples:
   import std/math