MorseDistanceModulator.py: be more precise in an error message

diff --git a/src/savemysugar/MorseDistanceModulator.py b/src/savemysugar/MorseDistanceModulator.py
index 417c5f9..1f78382 100755 (executable)
--- a/src/savemysugar/MorseDistanceModulator.py
+++ b/src/savemysugar/MorseDistanceModulator.py
@@ -34,7 +34,7 @@ class SymbolTime(object):
         assert multiplier >= 0
         if (period_min == period_max) and (min_inter_symbol_distance == 0):
             raise ValueError("If (period_min == period_max) a non-zero",
-                             "inter-symbol distance MUST be specified")
+                             "min_inter_symbol_distance MUST be specified")
 
         symbol_distance = 2 * (period_max - period_min)
         if symbol_distance == 0: