diff --git a/Lib/fontbakery/checkrunner.py b/Lib/fontbakery/checkrunner.py
index <HASH>..<HASH> 100644
--- a/Lib/fontbakery/checkrunner.py
+++ b/Lib/fontbakery/checkrunner.py
@@ -962,6 +962,21 @@ class Spec:
       raise SetupError('Spec fails expected checks test:\n{}'.format(
                                               '\n'.join(message)))
 
+    def is_numerical_id(checkid):
+      try:
+        int(checkid.split('/')[-1])
+        return True
+      except:
+        return False
+    numerical_check_ids = [c for c in registered_checks if is_numerical_id(c)]
+    if numerical_check_ids:
+      num = len(numerical_check_ids)
+      percentage = 100.0 * num / len(registered_checks)
+      print(f'\nThere still are {num} numerical check IDs. ({percentage:.2f}%)\n'
+             'They should all be renamed to keyword-based IDs.\n'
+             'See: https://github.com/googlefonts/fontbakery/issues/2238\n\n')
+      # assert(percentage == 0)
+
   def resolve_alias(self, original_name):
     name = original_name
     seen = set()
computing how many numerical check IDs still remain to...

... be renamed into keyword-based IDs.
This will in the future become a hard-enforcement runtime self-test.
(issue #<I>)