diff --git a/swh/search/query_language/tokens.js b/swh/search/query_language/tokens.js
--- a/swh/search/query_language/tokens.js
+++ b/swh/search/query_language/tokens.js
@@ -61,6 +61,7 @@
     "git",
     "nixguix",
     "npm",
+    "opam",
     "pypi",
     "svn",
     "tar"