diff --git a/c4mate b/c4mate
index 7e28490..85366cc 100755
--- a/c4mate
+++ b/c4mate
@@ -271,6 +271,17 @@ function MatePad:buy(id)
         url_encode(self.USER), id, self.token))
 end
 
+-- Return id of last bought item in log.
+function MatePad:last_bought()
+    local log = self:parse_log()
+    for i = 1, #log do
+        if log[i].method == "buy" then
+            return log[i].parameter
+        end
+    end
+    return nil
+end
+
 -- Set new balance (in cents).
 function MatePad:set_balance(amount)
     return self:fetch(string.format(
@@ -301,14 +312,14 @@ Display current balance:
     c4mate
 Find and buy item (interactive):
     c4mate <query>
-Buy by item id (non-interactive):
+Buy by item id (non-interactive, special id '0' will re-buy last item in log):
     c4mate -b|--buy <id>
 Show log:
     c4mate -l|--log
 Add or subtract credits:
     c4mate +/-<amount>
 Give credits:
-    c4mate -g <amount> <user> [<reason>]]=])
+    c4mate -g|--give <amount> <user> [<reason>]]=])
     os.exit(0)
 end
 
@@ -373,6 +384,8 @@ elseif arg[1] == "-b" or arg[1] == "--buy" then
         return
     end
 
+    if id == 0 then id = pad:last_bought() end
+
     pad:init()
     if pad:buy(id) == "OK" then
         pad:update_balance()