diff --git a/config.lua b/config.lua
index 01c3d6c..f890e10 100644
--- a/config.lua
+++ b/config.lua
@@ -26,6 +26,8 @@ local common_cfg = {
     det_epsilon = false, -- take random actions with probability eps.
     layernorm = false,
 
+    learning_rate = 1.0,
+
     init_zeros = true, -- instead of he_normal noise or whatever.
     graycode = false,
     unperturbed_trial = true, -- do a trial without any noise.
@@ -65,7 +67,9 @@ local cfg = {
 setmetatable(cfg, {
     __index = function(t, n)
         if common_cfg[n] ~= nil then return common_cfg[n] end
+        if n == 'log_fn' then return nil end
         if n == 'params_fn' then return nil end
+        if n == 'stats_fn' then return nil end
         error("cannot use undeclared config '" .. tostring(n) .. "'", 2)
     end
 })