diff --git a/.quality.exs b/.quality.exs
index c8a2fa3..f8a4599 100644
--- a/.quality.exs
+++ b/.quality.exs
@@ -3,8 +3,9 @@
 # Two ways to run:
 #
 #   mix quality                 - full gate: format, compile, credo --strict,
-#                                 dialyzer, dependency audit, full suite with
-#                                 coverage. Required green before every commit.
+#                                 dialyzer, dependency audit, docs, doc links,
+#                                 full suite with coverage. Required green
+#                                 before every commit.
 #
 #   mix quality --profile loop  - inner loop while implementing: skips dialyzer
 #                                 and coverage, runs only the tests covering
@@ -29,6 +30,21 @@
     strict: true
   ],
 
+  # The two docs stages make this gate the pre-publish check for the package's
+  # docs. Docs runs `mix docs` and fails on any ExDoc warning. Doc links fails
+  # on the link rules ExDoc accepts silently: a README relative link to a file
+  # not in the package files, a published relative link to a file that is not
+  # an extra, two extras sharing a basename, a silent rewrite to a different
+  # extra. Both are opt-in in ex_quality; `:auto` runs them when :ex_doc is
+  # installed.
+  docs: [
+    enabled: :auto
+  ],
+
+  doc_links: [
+    enabled: :auto
+  ],
+
   profiles: [
     loop: [
       stages: [:format, :compile, :credo, :test],
diff --git a/mix.exs b/mix.exs
index 34c5c51..80207ea 100644
--- a/mix.exs
+++ b/mix.exs
@@ -12,7 +12,7 @@ defmodule Predicator.MixProject do
     {:ex_doc, "~> 0.40", only: :dev, runtime: false},
     {:credo, "~> 1.7", only: [:dev, :test], runtime: false},
     {:excoveralls, "~> 0.18", only: :test},
-    {:ex_quality, "~> 0.14", only: :dev, runtime: false},
+    {:ex_quality, "~> 0.15", only: :dev, runtime: false},
     {:benchee, "~> 1.3", only: :dev, runtime: false}
   ]
 
diff --git a/mix.lock b/mix.lock
index 5f2ba13..dc5e171 100644
--- a/mix.lock
+++ b/mix.lock
@@ -8,7 +8,7 @@
   "earmark_parser": {:hex, :earmark_parser, "1.4.46", "67607a0532e810c6f630a515c548d0b24949643f168cc556303bee4cf96105c7", [:mix], [], "hexpm", "9c44636e8a1c68c62f526b2dcd85d941dbbcee7ab82cf64ba06ce28bef8e89f5"},
   "erlex": {:hex, :erlex, "0.2.7", "810e8725f96ab74d17aac676e748627a07bc87eb950d2b83acd29dc047a30595", [:mix], [], "hexpm", "3ed95f79d1a844c3f6bf0cea61e0d5612a42ce56da9c03f01df538685365efb0"},
   "ex_doc": {:hex, :ex_doc, "0.40.3", "4a972ffe64bc07dc605af487e98fc19b72a4185f55ca031b94c0552d6071c1d9", [:mix], [{:earmark_parser, "~> 1.4.44", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_c, ">= 0.1.0", [hex: :makeup_c, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 0.14 or ~> 1.0", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1 or ~> 1.0", [hex: :makeup_erlang, repo: "hexpm", optional: false]}, {:makeup_html, ">= 0.1.0", [hex: :makeup_html, repo: "hexpm", optional: true]}], "hexpm", "2756e357742fecd9749b489b85d67c9ce99c465f2e75728d9e6dc8d704b973de"},
-  "ex_quality": {:hex, :ex_quality, "0.14.0", "702ed122c85c1d1f1dca2efab60871884e9ba6aefc492f334da51a8175543cc6", [:mix], [{:jason, "~> 1.4", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "ac8553e6b7a6a35ada03ef748530db2c5871d69427d74a634fd37afdeabf7e24"},
+  "ex_quality": {:hex, :ex_quality, "0.15.0", "e5af847cd6f78c8bde25f8cf8e96c8e3e92ed768affe3711dca05065887771b6", [:mix], [{:jason, "~> 1.4", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "b1d8943973be502fd5c5210f5f96e88b1262ce813b6d50092315a613573deb08"},
   "excoveralls": {:hex, :excoveralls, "0.18.5", "e229d0a65982613332ec30f07940038fe451a2e5b29bce2a5022165f0c9b157e", [:mix], [{:castore, "~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "523fe8a15603f86d64852aab2abe8ddbd78e68579c8525ae765facc5eae01562"},
   "file_system": {:hex, :file_system, "1.1.0", "08d232062284546c6c34426997dd7ef6ec9f8bbd090eb91780283c9016840e8f", [:mix], [], "hexpm", "bfcf81244f416871f2a2e15c1b515287faa5db9c6bcf290222206d120b3d43f6"},
   "jason": {:hex, :jason, "1.4.5", "2e3a008590b0b8d7388c20293e9dcc9cf3e5d642fd2a114e4cbbb52e595d940a", [:mix], [{:decimal, "~> 1.0 or ~> 2.0 or ~> 3.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "b0c823996102bcd0239b3c2444eb00409b72f6a140c1950bc8b457d836b30684"},