Added comment
diff --git a/curator-recipes/src/main/java/org/apache/curator/framework/recipes/nodes/PersistentNode.java b/curator-recipes/src/main/java/org/apache/curator/framework/recipes/nodes/PersistentNode.java
index bf11f81..5f94ea1 100644
--- a/curator-recipes/src/main/java/org/apache/curator/framework/recipes/nodes/PersistentNode.java
+++ b/curator-recipes/src/main/java/org/apache/curator/framework/recipes/nodes/PersistentNode.java
@@ -309,7 +309,10 @@
     }
 
     /**
-     * Set data that node should set in ZK also writes the data to the node
+     * Set data that node should set in ZK also writes the data to the node. NOTE: it
+     * is an error to call this method after {@link #start()} but before the initial create
+     * has completed. Use {@link #waitForInitialCreate(long, TimeUnit)} to ensure initial
+     * creation.
      *
      * @param data new data value
      * @throws Exception errors