Update data-collection-text-log.md

-------
cc: @guywi-ms

Author: JeffreyWolford

articles/azure-monitor/agents/data-collection-text-log.md

@@ -47,7 +47,7 @@ The custom table must be created before you can send data to it. When you create
 Use the **Tables - Update** API to create the table with the PowerShell code below. This code creates a table called *MyTable_CL* with two columns. Modify this schema to collect a different table. 
 
 > [!IMPORTANT]
-> Custom tables must use a suffix of *_CL*.
+> Custom tables must use a suffix of *_CL* as in *tablename_CL*. The *tablename_CL* in the DataFlows Streams must match the *tablename_CL* name created in the log Analytics workspace.
 
 1. Click the **Cloud Shell** button in the Azure portal and ensure the environment is set to **PowerShell**.
 
@@ -180,6 +180,9 @@ The [data collection rule (DCR)](../essentials/data-collection-rule-overview.md)
     **Data collection rule for text log**
     
     See [Structure of a data collection rule in Azure Monitor (preview)](../essentials/data-collection-rule-structure.md#custom-logs) if you want to modify the text log DCR.
+    
+    > [!IMPORTANT]
+    > Custom tables must use a suffix of *_CL* as in *tablename_CL*. The *tablename_CL* in the DataFlows Streams must match the *tablename_CL* name created in the log Analytics workspace.
 
     ```json
     {