diff -r 5e5815fdcd2d -r ab27422a34b0 src/CLIParser.h
--- a/src/CLIParser.h	Thu Sep 24 16:03:05 2020 +0200
+++ b/src/CLIParser.h	Thu Sep 24 20:37:52 2020 +0200
@@ -99,8 +99,10 @@
 			} else if (option == OPTION_RECORDS) {
 				while (i < arguments.size()) readNextRecord(arguments, i, currentRelation);
 			} else if (option == OPTION_RECORDS_STDIN) {
-				for (RelationConfiguration r : c.relationConfigurations) if (r.valueStream) throw relpipe::cli::RelpipeCLIException(L"Only one relation can read data from STDIN.", relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);
-				currentRelation.valueStream = &std::cin;
+				if (parseBoolean(readNext(arguments, i))) {
+					for (RelationConfiguration r : c.relationConfigurations) if (r.valueStream) throw relpipe::cli::RelpipeCLIException(L"Only one relation can read data from STDIN.", relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);
+					currentRelation.valueStream = &std::cin;
+				}
 			} else throw relpipe::cli::RelpipeCLIException(L"Unsupported CLI option: " + option, relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);
 		}
 		addRelation(c, currentRelation); // last relation
@@ -117,7 +119,7 @@
 const relpipe::writer::string_t CLIParser::OPTION_ATTRIBUTE = L"--attribute";
 const relpipe::writer::string_t CLIParser::OPTION_RECORD = L"--record";
 const relpipe::writer::string_t CLIParser::OPTION_RECORDS = L"--records";
-const relpipe::writer::string_t CLIParser::OPTION_RECORDS_STDIN = L"--records-from-stdin";
+const relpipe::writer::string_t CLIParser::OPTION_RECORDS_STDIN = L"--records-on-stdin";
 
 }
 }