diff --git a/Documentation/i2c/writing-clients b/Documentation/i2c/writing-clients
index e94d9c6..cff7b65 100644
--- a/Documentation/i2c/writing-clients
+++ b/Documentation/i2c/writing-clients
@@ -273,6 +273,7 @@
     if (is_isa) {
 
       /* Discard immediately if this ISA range is already used */
+      /* FIXME: never use check_region(), only request_region() */
       if (check_region(address,FOO_EXTENT))
         goto ERROR0;