diff --git a/src/Lean/Elab/Tactic/Grind.lean b/src/Lean/Elab/Tactic/Grind.lean
index 7e802118a6..da4b8060a9 100644
--- a/src/Lean/Elab/Tactic/Grind.lean
+++ b/src/Lean/Elab/Tactic/Grind.lean
@@ -167,7 +167,7 @@ def evalGrindCore
   let only := only.isSome
   let params := if let some params := params then params.getElems else #[]
   if Grind.grind.warning.get (← getOptions) then
-    logWarningAt ref "The `grind` tactic is experimental and still under development. Avoid using it in production projects"
+    logWarningAt ref "The `grind` tactic is experimental and still under development. Avoid using it in production projects."
   let declName := (← Term.getDeclName?).getD `_grind
   withMainContext do
     let result ← grind (← getMainGoal) config only params declName fallback