diff --git a/chameleonic.p8 b/chameleonic.p8
index 8d8196c..ea33d55 100644
--- a/chameleonic.p8
+++ b/chameleonic.p8
@@ -41,6 +41,8 @@ end
 -- fake sprintf function
 -- %~ for literal "%"
 -- %v for param
+-- %! for tostring(param)
+--    which dumps tables
 function fmt(f, ...)
  local out, i = "", 1
  for s in all(split(f,"%")) do
@@ -51,9 +53,11 @@ function fmt(f, ...)
    local p = select(i,...)
    i+=1
    if m == "v" then
-    out ..= select(i,...)
+    out ..= p
+   elseif m == "!" then
+    out ..= tostring(p)
    else
-    out ..= "(?!:"..m..":"..tostr(p)..")"
+    out ..= "(?!:"..m..":"..tostring(p)..")"
    end
   end
   out ..=sub(s,2)