diff --git a/tests/README.md b/tests/README.md
index 284974b..0f1a916 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -48,6 +48,9 @@ The columns are:
 | `cri_hex`          | `cri` in CBOR hexdump format                                                            |
 | `resolved_cri_hex` | `resolved_cri` in CBOR hexdump format                                                   |
 | `description`      | comment                                                                                 |
+| `features_needed`  | comma-separted list of features that are needed, possibly including "broken"[^1]        |
+
+[^1]: Tests with the feature "broken" look somewhat right, and implementations that don't reject them outright would probably come to the test vector's conclusions, but something is wrong about them. The description usually describes what that is.
 
 An initial line with type `base` gives the base URI and CRI applied, see above.
 
diff --git a/tests/tests.csv b/tests/tests.csv
index 8e91306..6353b6c 100644
--- a/tests/tests.csv
+++ b/tests/tests.csv
@@ -1,4 +1,4 @@
-type;uri;cri;red;resolved_uri;resolved_cri;cri_hex;resolved_cri_hex;comment
+type;uri;cri;red;resolved_uri;resolved_cri;cri_hex;resolved_cri_hex;comment;features_neeeded
 base;coaps://foo:4711/pa/th?query#frag;[-2, ["foo", 4711], ["pa", "th"], ["query"], "frag"];;;;85218263666f6f19126782627061627468816571756572796466726167
 rt;;[0];;coaps://foo:4711/pa/th?query#frag;[-2, ["foo", 4711], ["pa", "th"], ["query"], "frag"];8100;85218263666f6f19126782627061627468816571756572796466726167;
 rt;//a;[null, ["a"]];;coaps://a;[-2, ["a"]];82f6816161;8221816161;
@@ -98,7 +98,7 @@ rt;/a?b#c;[true, ["a"], ["b"], "c"];;coaps://foo:4711/a?b#c;[-2, ["foo", 4711],
 rt;?a&b&c;[0, null, ["a", "b", "c"]];;coaps://foo:4711/pa/th?a&b&c;[-2, ["foo", 4711], ["pa", "th"], ["a", "b", "c"]];8300f683616161626163;84218263666f6f1912678262706162746883616161626163;
 rt;;[];;coaps://foo:4711/pa/th?query#frag;[-2, ["foo", 4711], ["pa", "th"], ["query"], "frag"];80;85218263666f6f19126782627061627468816571756572796466726167;Empty CRI Reference ~ [0]
 rt;//a.b;[null, ["a", "b"]];;coaps://a.b;[-2, ["a", "b"]];82f68261616162;82218261616162;Dotted host name
-rt;//a%2Ea;[null, ["a.a"]];;coaps://a%2Eb;[-2, ["a.a"]];82f68163612e61;82218163612e61;Weird non-PET in host
+rt;//a%2Ea;[null, ["a.a"]];;coaps://a%2Eb;[-2, ["a.a"]];82f68163612e61;82218163612e61;Weird non-PET in host (not allowed: URI normalization would turn that into coaps://a.b);broken
 rt;//a%3Aa;[null, [["a", h'3A', "a"]]];;coaps://a%3Aa;[-2, [["a", h'3A', "a"]]];82f681836161413a6161;822181836161413a6161;PET (':') in host
 rt;/a%2Fa%25a;[true, ["a/a%a"]];;coaps://foo:4711/a%2Fa%25a;[-2, ["foo", 4711], ["a/a%a"]];82f58165612f612561;83218263666f6f1912678165612f612561;Non-PET in path
 rt;|/a;a|;|[true, ["a;a"]]|;;|coaps://foo:4711/a;a|;|[-2, ["foo", 4711], ["a;a"]]|;82f58163613b61;83218263666f6f1912678163613b61;Semicolon in path (pretty tame, but contrasting the next example)