diff --git a/src/modules/sanity/README b/src/modules/sanity/README
index 14aa8462cc9..588f53deae5 100644
--- a/src/modules/sanity/README
+++ b/src/modules/sanity/README
@@ -183,6 +183,9 @@ modparam("sanity", "autodrop", 1)
    module sends a precise error reply via SL send_reply(). Thus there is
    no need to reply with a generic error message.
 
+   The parameters can be static integers or variables holding integer
+   values.
+
    Example 1.5. sanity_check usage
 ...
 if (!sanity_check()) {