diff --git a/bigtable/cmd/cbt/cbt.go b/bigtable/cmd/cbt/cbt.go
index 5c1081c..ebfd441 100644
--- a/bigtable/cmd/cbt/cbt.go
+++ b/bigtable/cmd/cbt/cbt.go
@@ -403,10 +403,12 @@
 		do:   doLookup,
 		Usage: "cbt lookup <table-id> <row-key> [columns=<family>:<qualifier>,...] [cells-per-column=<n>] " +
 			" [app-profile=<app profile id>]\n" +
+			"  row-key                             String value of key, raw bytes are supported but need to be prefixed with a dollar sign and use single quotes\n" +
 			"  columns=<family>:<qualifier>,...    Read only these columns, comma-separated\n" +
 			"  cells-per-column=<n>                Read only this number of cells per column\n" +
 			"  app-profile=<app-profile-id>        The app profile ID to use for the request\n\n" +
-			" Example: cbt lookup mobile-time-series phone#4c410523#20190501 columns=stats_summary:os_build,os_name cells-per-column=1",
+			" Example: cbt lookup mobile-time-series phone#4c410523#20190501 columns=stats_summary:os_build,os_name cells-per-column=1\n" +
+			" Example: cbt lookup mobile-time-series $'\\x41\\x42'",
 		Required: cbtconfig.ProjectAndInstanceRequired,
 	},
 	{
diff --git a/bigtable/cmd/cbt/cbtdoc.go b/bigtable/cmd/cbt/cbtdoc.go
index b172471..5cefbdb 100644
--- a/bigtable/cmd/cbt/cbtdoc.go
+++ b/bigtable/cmd/cbt/cbtdoc.go
@@ -38,6 +38,7 @@
     deletecolumn              Delete all cells in a column
     deletefamily              Delete a column family
     deleterow                 Delete a row
+    deleteallrows             Delete all rows
     deletetable               Delete a table
     doc                       Print godoc-suitable documentation for cbt
     help                      Print help text
@@ -232,6 +233,16 @@
 
 
 
+Delete all rows
+
+Usage:
+	cbt deleteallrows <table-id>
+
+	    Example: cbt deleteallrows  mobile-time-series
+
+
+
+
 Delete a table
 
 Usage:
@@ -280,11 +291,13 @@
 
 Usage:
 	cbt lookup <table-id> <row-key> [columns=<family>:<qualifier>,...] [cells-per-column=<n>]  [app-profile=<app profile id>]
+	  row-key                             String value of key, raw bytes are supported but need to be prefixed with a dollar sign and use single quotes
 	  columns=<family>:<qualifier>,...    Read only these columns, comma-separated
 	  cells-per-column=<n>                Read only this number of cells per column
 	  app-profile=<app-profile-id>        The app profile ID to use for the request
 
 	 Example: cbt lookup mobile-time-series phone#4c410523#20190501 columns=stats_summary:os_build,os_name cells-per-column=1
+	 Example: cbt lookup mobile-time-series $'\x41\x42'