diff --git a/src/equilibrium/render.clj b/src/equilibrium/render.clj
index 52782bd..bef6a7a 100644
--- a/src/equilibrium/render.clj
+++ b/src/equilibrium/render.clj
@@ -177,7 +177,9 @@
                          (blog-sites-preview blog-name)))
         envs-fn (fn [result [match-str env-name]]
                   (when (= nil (System/getenv env-name))
-                    (throw (ex-info (str "env var not found " env-name))))
+                    (throw (ex-info (str "env var not found " env-name)
+                                    {:env-var env-name
+                                     :match-str match-str})))
                   (string/replace result
                                   match-str
                                   (System/getenv env-name)))]