--- a/1-Ruby/logic.rb	Mon Jan 02 21:13:00 2017 +0000
+++ b/1-Ruby/logic.rb	Mon Jan 02 21:16:35 2017 +0000
@@ -31,4 +31,18 @@
 	puts "x equal 4"
 else
 	puts "x not equals 4"
-end
\ No newline at end of file
+end
+
+# "then" is optional, except in single line statement
+if x == 4 then puts "x equal 4" end
+if x == 4 then
+	puts "x equal 4"
+end
+if x == 4
+	puts "x equal 4"
+end
+# The following line gives:
+#   logic.rb:…: syntax error, unexpected tIDENTIFIER, expecting keyword_then or ';' or '\n'
+#   if x == 4 puts "x equal 4" end
+#
+# if x == 4 puts "x equal 4" end
\ No newline at end of file