diff --git a/src/AnalysisPrograms/ConcatenateIndexFiles.cs b/src/AnalysisPrograms/ConcatenateIndexFiles.cs
index abc59d7b9..87c863f56 100644
--- a/src/AnalysisPrograms/ConcatenateIndexFiles.cs
+++ b/src/AnalysisPrograms/ConcatenateIndexFiles.cs
@@ -101,7 +101,7 @@ public class Arguments : SubCommandBase
             public TimeSpan? TimeSpanOffsetHint { get; set; }
 
             [Option(
-                CommandOptionType.SingleValue,
+                CommandOptionType.NoValue,
                 Description = "Draw false-colour spectrograms after concatenating index files",
                 ShortName = "")]
             public bool DrawImages { get; set; } = true;
@@ -131,6 +131,7 @@ public class Arguments : SubCommandBase
             public string FalseColourSpectrogramConfig { get; set; }
 
             [Option(
+                CommandOptionType.NoValue,
                 Description = "Set true only when concatenating more than 24-hours of data into one image",
                 LongName = "concatenate-everything",
                 ShortName = "")]
diff --git a/src/AnalysisPrograms/DummyAnalysis.cs b/src/AnalysisPrograms/DummyAnalysis.cs
index cf25e2083..1769e256e 100644
--- a/src/AnalysisPrograms/DummyAnalysis.cs
+++ b/src/AnalysisPrograms/DummyAnalysis.cs
@@ -33,7 +33,7 @@ public class DummyAnalysis
 
         [Command(
             CommandName,
-            Description = "An program designed to simulate load - does nothing other than burn CPU;")]
+            Description = "A program designed to simulate load - does nothing other than burn CPU;")]
         public class Arguments : SubCommandBase
         {
             [Option(Description = "Burn load on multiple CPU threads?")]