diff --git a/lua/ts.lua b/lua/ts.lua
index 7812378..fd02180 100644
--- a/lua/ts.lua
+++ b/lua/ts.lua
@@ -66,10 +66,14 @@ function M.build(repo, parser)
 
     local function on_build(r)
         if r.code ~= 0 then
+            local detail = r.stderr ~= "" and r.stderr
+                or r.stdout ~= "" and r.stdout
+                or "(no output)"
             log.error(
-                "Failed to build parser for %s: %s",
+                "Failed to build parser for %s (exit %d): %s",
                 parser.lang,
-                r.stderr or ""
+                r.code,
+                detail
             )
             return
         end
@@ -103,10 +107,14 @@ function M.build(repo, parser)
             },
             vim.schedule_wrap(function(r)
                 if r.code ~= 0 then
+                    local detail = r.stderr ~= "" and r.stderr
+                        or r.stdout ~= "" and r.stdout
+                        or "(no output)"
                     log.error(
-                        "Failed to generate parser for %s: %s",
+                        "Failed to generate parser for %s (exit %d): %s",
                         parser.lang,
-                        r.stderr or ""
+                        r.code,
+                        detail
                     )
                     return
                 end