Handle empty spec when computing steps

1 files changed, 1 insertions, 1 deletions

diff --git a/documentapi/src/main/java/com/yahoo/documentapi/messagebus/protocol/ContentPolicy.java b/documentapi/src/main/java/com/yahoo/documentapi/messagebus/protocol/ContentPolicy.java
index 2d78497456d..c03231543df 100644
--- a/documentapi/src/main/java/com/yahoo/documentapi/messagebus/protocol/ContentPolicy.java
+++ b/documentapi/src/main/java/com/yahoo/documentapi/messagebus/protocol/ContentPolicy.java
@@ -229,7 +229,7 @@ public class ContentPolicy extends SlobrokPolicy {
             clusterName = params.get("cluster");
             distributionConfigId = params.get("clusterconfigid"); // TODO jonmv: remove
             slobrokHostPatternGenerator = createPatternGenerator();
-            if (clusterName == null) throw new IllegalArgumentException("Required parameter cluster with clustername not set");
+            if (clusterName == null) throw new IllegalArgumentException("Required parameter 'cluster', the name of the content cluster, not set");
         }
 
         String getDistributionConfigId() {