diff --git a/python/generate_syntax_highlightining.py b/python/generate_syntax_highlightining.py
index fa2433f..0f8e620 100755
--- a/python/generate_syntax_highlightining.py
+++ b/python/generate_syntax_highlightining.py
@@ -63,7 +63,11 @@ def match_all_variants(token_names):
              "match": f"\\b({dollar_keywords})\\b",
          }
      ],
-     }
+     },
+    # Linkage lines.
+    # TODO: use a different colour for this class of lines.
+    {"name": "support.class.linkage.atf",
+     "match": "^(>>|<<|\\|\\|).*"},
 ]
 
 strings = {}
diff --git a/syntaxes/atf.tmLanguage.json b/syntaxes/atf.tmLanguage.json
index 48b2c29..7447b8c 100644
--- a/syntaxes/atf.tmLanguage.json
+++ b/syntaxes/atf.tmLanguage.json
@@ -47,6 +47,10 @@
                             "match": "\\b(most|least|about|several|some|rest|of|start|beginning|middle|end|columns|line|lines|case|cases|surface|space|blank|broken|effaced|illegible|missing|traces|ruling|single|double|triple|at|Most|Least|About|Several|Some|Rest|Of|Start|Beginning|Middle|End|Columns|Line|Lines|Case|Cases|Surface|Space|Blank|Broken|Effaced|Illegible|Missing|Traces|Ruling|Single|Double|Triple|At)\\b"
                         }
                     ]
+                },
+                {
+                    "name": "support.class.linkage.atf",
+                    "match": "^(>>|<<|\\|\\|).*"
                 }
             ]
         },