README clarification

Roo::Spreadsheet requires spreadsheet gem
dizhu · Feb 9, 2014 · 142bba4 · 142bba4
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commit 142bba4
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diff --git a/README.markdown b/README.markdown
@@ -70,6 +70,9 @@ s.font(1,1).italic?
 s.font(1,1).underline?
 
 
+# Roo::Spreadsheet requires spreadsheet gem
+require 'spreadsheet'
+
 # Spreadsheet.open can accept both files and paths
 
 xls = Roo::Spreadsheet.open('./new_prices.xls')