Add missing period in comment.
diff --git a/Lib/test/test_bigmem.py b/Lib/test/test_bigmem.py
index 255428f..6d6c37c 100644
--- a/Lib/test/test_bigmem.py
+++ b/Lib/test/test_bigmem.py
@@ -28,7 +28,7 @@
# - While the bigmemtest decorator speaks of 'minsize', all tests will
# actually be called with a much smaller number too, in the normal
# test run (5Kb currently.) This is so the tests themselves get frequent
-# testing Consequently, always make all large allocations based on the
+# testing. Consequently, always make all large allocations based on the
# passed-in 'size', and don't rely on the size being very large. Also,
# memuse-per-size should remain sane (less than a few thousand); if your
# test uses more, adjust 'size' upward, instead.