diff --git a/matlab/reporting/@series/write.m b/matlab/reporting/@series/write.m
index f299dcbff44941c963d9137f35512dfc05ef8e8c..37565d7db0b52243859652dea28904d494ad8b72 100644
--- a/matlab/reporting/@series/write.m
+++ b/matlab/reporting/@series/write.m
@@ -42,8 +42,8 @@ assert(~isempty(o.data) && isa(o.data, 'dynSeries'), ...
 assert(ischar(o.color), '@series.write: color must be a string');
 assert(ischar(o.tableNegColor), '@series.write: tableNegColor must be a string');
 assert(ischar(o.tablePosColor), '@series.write: tablePosColor must be a string');
-assert(islogical(o.showTableMarkers), '@series.write: showTableMarkers must be a string');
-assert(islogical(o.tableAlignRight), '@series.write: tableAlignRight must be a string');
+assert(islogical(o.showTableMarkers), '@series.write: showTableMarkers must be true or false');
+assert(islogical(o.tableAlignRight), '@series.write: tableAlignRight must be true or false');
 
 %% Write Output
 dataString = ['%.' num2str(precision) 'f'];