diff --git a/pkg/cli/option_parse.go b/pkg/cli/option_parse.go
index dd5ede99f..912d689f1 100644
--- a/pkg/cli/option_parse.go
+++ b/pkg/cli/option_parse.go
@@ -2678,7 +2678,7 @@ var CommentsInDataFlagSection = FlagSection{
 		{
 			name: "--skip-comments-with",
 			arg:  "{string}",
-			help: "Ignore commented lines within input, with specified prefix.",
+			help: "Ignore commented lines within input, with specified prefix. For CSV input format, the prefix must be a single character.",
 			parser: func(args []string, argc int, pargi *int, options *TOptions) {
 				CheckArgCount(args, *pargi, argc, 2)
 				options.ReaderOptions.CommentString = args[*pargi+1]
@@ -2700,7 +2700,7 @@ var CommentsInDataFlagSection = FlagSection{
 		{
 			name: "--pass-comments-with",
 			arg:  "{string}",
-			help: "Immediately print commented lines within input, with specified prefix.",
+			help: "Immediately print commented lines within input, with specified prefix. For CSV input format, the prefix must be a single character.",
 			parser: func(args []string, argc int, pargi *int, options *TOptions) {
 				CheckArgCount(args, *pargi, argc, 2)
 				options.ReaderOptions.CommentString = args[*pargi+1]