1 files changed, 3 insertions, 0 deletions

diff --git a/main.nim b/main.nim
index cca5528..115808d 100644
--- a/main.nim
+++ b/main.nim
@@ -61,17 +61,20 @@ proc main() =
       of "log10": scale = log10
       of "ln": scale = ln
       of "linear", "lin": scale = (val: float) => val
+      else: raise newException(ValueError, "Unrecognised scale choice")
 
     of "symbols":
       case val:
       of "unicode", "utf8", "utf-8": symbols = UNICODE_SYMBOLS
       of "numeric", "ascii": symbols = NUMERIC_SYMBOLS
+      else: raise newException(ValueError, "Unrecognised symbols choice")
 
     of "timestamp":
       case val:
       of "datetime", "date-time": timestampHeader = formatTimestampDateTime
       of "unix", "epoch": timestampHeader = formatTimestampUnix
       of "none", "false": timestampHeader = formatTimestampNone
+      else: raise newException(ValueError, "Unrecognised timestamp choice")
 
     of "range":
       let parts = val.split(':', 1)