add role definition key id / threshold requirements
diff --git a/src/metadata.rs b/src/metadata.rs
index 75f1f6b..7d9fcf5 100644
--- a/src/metadata.rs
+++ b/src/metadata.rs
@@ -342,7 +342,7 @@
 
         if key_ids.len() < threshold {
             return Err(Error::IllegalArgument(format!(
-                "Cannot have a threshold greater than the number of associated key IDs",
+                "Cannot have a threshold greater than the number of associated key IDs. {} vs. {}",
                 threshold,
                 key_ids.len()
             )));