diff --git a/.clang-tidy b/.clang-tidy
new file mode 100644
index 000000000..0887b8670
--- /dev/null
+++ b/.clang-tidy
@@ -0,0 +1,3 @@
+# We use pointers to aggregates in a couple of places, intentionally.
+# void * would look weird.
+Checks: '-bugprone-sizeof-expression'
diff --git a/src/libstore/build/worker.hh b/src/libstore/build/worker.hh
index 23ad87914..ced013ddd 100644
--- a/src/libstore/build/worker.hh
+++ b/src/libstore/build/worker.hh
@@ -116,7 +116,7 @@ private:
     WeakGoals waitingForAWhile;
 
     /**
-     * Last time the goals in `waitingForAWhile` where woken up.
+     * Last time the goals in `waitingForAWhile` were woken up.
      */
     steady_time_point lastWokenUp;