diff --git a/core/src/main/scala/spark/storage/BlockManagerMasterActor.scala b/core/src/main/scala/spark/storage/BlockManagerMasterActor.scala
index 2830bc62975ae53599eb9f645b7cfa52e30c6572..9ab451b46b95c1f3428d82ec9f58b6a2b3639db4 100644
--- a/core/src/main/scala/spark/storage/BlockManagerMasterActor.scala
+++ b/core/src/main/scala/spark/storage/BlockManagerMasterActor.scala
@@ -121,7 +121,8 @@ class BlockManagerMasterActor(val isLocal: Boolean) extends Actor with Logging {
     val toRemove = new HashSet[BlockManagerId]
     for (info <- blockManagerInfo.values) {
       if (info.lastSeenMs < minSeenTime) {
-        logWarning("Removing BlockManager " + info.blockManagerId + " with no recent heart beats")
+        logWarning("Removing BlockManager " + info.blockManagerId + " with no recent heart beats: "
+          (now - info.lastSeenMs) + "ms exceeds " + slaveTimeout + "ms")
         toRemove += info.blockManagerId
       }
     }