killbill-memoizeit

diff --git a/invoice/src/main/java/org/killbill/billing/invoice/usage/ContiguousIntervalUsageInArrear.java b/invoice/src/main/java/org/killbill/billing/invoice/usage/ContiguousIntervalUsageInArrear.java
index 8af590a..c79db5c 100644
--- a/invoice/src/main/java/org/killbill/billing/invoice/usage/ContiguousIntervalUsageInArrear.java
+++ b/invoice/src/main/java/org/killbill/billing/invoice/usage/ContiguousIntervalUsageInArrear.java
@@ -403,8 +403,7 @@ public class ContiguousIntervalUsageInArrear {
             case TOP_TIER:
                 return computeToBeBilledConsumableInArrearWith_TOP_TIER(tieredBlocks, roUnit.getAmount());
             default:
-                throw new IllegalStateException("Unknwon TierBlockPolicy " + usage.getTierBlockPolicy());
-
+                throw new IllegalStateException("Unknown TierBlockPolicy " + usage.getTierBlockPolicy());
         }
     }