diff --git a/doerg/src/net/deertopia/doerg/render.clj b/doerg/src/net/deertopia/doerg/render.clj
index 89f8739..65cf602 100644
--- a/doerg/src/net/deertopia/doerg/render.clj
+++ b/doerg/src/net/deertopia/doerg/render.clj
@@ -137,15 +137,16 @@
                         (swap! promises #(conj % {:promise p :node node}))
                         (assoc node ::rendered p)))))
         f (fn []
-            (println "run")
-            (prn (count @promises))
-            (Thread/sleep (* 1000 1))
             (doseq [{:keys [promise node]} @promises]
-              (try (let [{:keys [value contents]} node]
-                     (deliver promise (tex/render-temml (or contents value))))
-                   (catch Throwable e
+              (try (let [{:keys [value contents]} node
+                         temml (tex/render-temml (or contents value))]
+                     (if (tex/erroneous-temml-output? temml)
+                       (deliver promise "errors!! aghhh!!")
+                       (deliver promise temml)))
+                   (catch Exception e
                      (prn e)
-                     (flush))))
+                     (flush)
+                     (throw e))))
             #_
             (doseq [[ix {:keys [promise node]}]
                     (map (fn [i x] [i x]) (range) @promises)]
diff --git a/doerg/src/net/deertopia/doerg/tex.clj b/doerg/src/net/deertopia/doerg/tex.clj
index e1dd98e..a32cdbf 100644
--- a/doerg/src/net/deertopia/doerg/tex.clj
+++ b/doerg/src/net/deertopia/doerg/tex.clj
@@ -116,7 +116,13 @@
         slurp
         (str/replace-first "% {{contents}}" contents))))
 
-(defn render-xelatex [output-dir & snippets]
+(defn render-xelatex
+  "Render a collection of `snippets` to SVGs in `output-dir` using
+  XeLaTeX and dvisvgm. Returns a map whose keys are `snippets` and
+  whose values are maps containing dimensional info, a string of
+  errors output by XeLaTeX, and the path to the generated SVG
+  file. Math delimiters are *not* implicitly added to each snippet."
+  [output-dir & snippets]
   (fs/with-temp-dir [dir {:prefix "doerg-xelatex"}]
     (let [preview-tex (fs/file dir "preview.tex")
           preview-xdv (fs/file dir "preview.xdv")