The list renamed nicknamed contacts to "Nickname (Name)" while
matches? still only tried the FN, so the displayed name was the one
thing search could not find.

Assisted-by: GLM-5.3 via pi

diff --git a/lib/pro_tacts/admin/contacts_index.rb b/lib/pro_tacts/admin/contacts_index.rb
index 9e59544..a68a80c 100644
--- a/lib/pro_tacts/admin/contacts_index.rb
+++ b/lib/pro_tacts/admin/contacts_index.rb
@@ -61,10 +61,14 @@ module ProTacts
         nickname || name || contact.id
       end
 
+      # Match generously (docs/DESIGN.md): a contact is findable by
+      # name — the nickname too, being the name it lists under — any
+      # of its values, or the groups it belongs to.
       #: (Row row, String query) -> bool
       def matches?(row, query)
         q = query.downcase
         return true if row.contact.name&.downcase&.include?(q)
+        return true if row.contact.nickname&.downcase&.include?(q)
         return true if row.contact.phones.any? { it.value.downcase.include?(q) }
         return true if row.contact.emails.any? { it.value.downcase.include?(q) }
 
diff --git a/test/pro_tacts/admin/test_contacts_pages.rb b/test/pro_tacts/admin/test_contacts_pages.rb
index 2d68126..e6b423b 100644
--- a/test/pro_tacts/admin/test_contacts_pages.rb
+++ b/test/pro_tacts/admin/test_contacts_pages.rb
@@ -193,6 +193,18 @@ class AdminContactsPagesTest < Minitest::Test
     end
   end
 
+  # The nickname is a name the contact lists under, so it finds the
+  # contact the same way the name does.
+  def test_search_matches_the_nickname
+    red = ADA.sub("FN:Ada Lovelace", "FN:Sarah\r\nNICKNAME:Red").sub("UID:ada", "UID:red")
+
+    with_contacts({"red" => red}) do
+      get "/", q: "red"
+
+      assert_includes last_response.body, "Red (Sarah)"
+    end
+  end
+
   def test_search_with_no_matches_says_so
     with_contacts({"ada" => ADA}) do
       get "/", q: "nobody"