diff --git a/doc/stringio/each_byte.rdoc b/doc/stringio/each_byte.rdoc
index a635ce3..5201afb 100644
--- a/doc/stringio/each_byte.rdoc
+++ b/doc/stringio/each_byte.rdoc
@@ -7,10 +7,7 @@ returns +self+:
   strio.each_byte {|byte| bytes.push(byte) }
   strio.eof? # => true
   bytes # => [104, 101, 108, 108, 111]
-  bytes = []
-  strio = StringIO.new('тест')      # Four 2-byte characters.
-  strio.each_byte {|byte| bytes.push(byte) }
-  bytes # => [209, 130, 208, 181, 209, 129, 209, 130]
+
   bytes = []
   strio = StringIO.new('こんにちは')  # Five 3-byte characters.
   strio.each_byte {|byte| bytes.push(byte) }
diff --git a/doc/stringio/each_char.rdoc b/doc/stringio/each_char.rdoc
index d0ab189..bde0e3a 100644
--- a/doc/stringio/each_char.rdoc
+++ b/doc/stringio/each_char.rdoc
@@ -7,10 +7,7 @@ returns +self+:
   strio.each_char {|char| chars.push(char) }
   strio.eof? # => true
   chars      # => ["h", "e", "l", "l", "o"]
-  chars = []
-  strio = StringIO.new('тест')
-  strio.each_char {|char| chars.push(char) }
-  chars      # => ["т", "е", "с", "т"]
+
   chars = []
   strio = StringIO.new('こんにちは')
   strio.each_char {|char| chars.push(char) }
diff --git a/doc/stringio/each_codepoint.rdoc b/doc/stringio/each_codepoint.rdoc
index 2fc33f4..af70b4c 100644
--- a/doc/stringio/each_codepoint.rdoc
+++ b/doc/stringio/each_codepoint.rdoc
@@ -9,10 +9,7 @@ Each codepoint is the integer value for a character; returns self:
   strio.each_codepoint {|codepoint| codepoints.push(codepoint) }
   strio.eof? # => true
   codepoints # => [104, 101, 108, 108, 111]
-  codepoints = []
-  strio = StringIO.new('тест')
-  strio.each_codepoint {|codepoint| codepoints.push(codepoint) }
-  codepoints # => [1090, 1077, 1089, 1090]
+
   codepoints = []
   strio = StringIO.new('こんにちは')
   strio.each_codepoint {|codepoint| codepoints.push(codepoint) }
diff --git a/doc/stringio/getbyte.rdoc b/doc/stringio/getbyte.rdoc
index 5e52494..148455a 100644
--- a/doc/stringio/getbyte.rdoc
+++ b/doc/stringio/getbyte.rdoc
@@ -14,13 +14,6 @@ Returns +nil+ if at end-of-stream:
 
 Returns a byte, not a character:
 
-  s = 'Привет'
-  s.bytes
-  # => [208, 159, 209, 128, 208, 184, 208, 178, 208, 181, 209, 130]
-  strio = StringIO.new(s)
-  strio.getbyte # => 208
-  strio.getbyte # => 159
-
   s = 'こんにちは'
   s.bytes
   # => [227, 129, 147, 227, 130, 147, 227, 129, 171, 227, 129, 161, 227, 129, 175]
diff --git a/doc/stringio/getc.rdoc b/doc/stringio/getc.rdoc
index b2ab468..58ce47c 100644
--- a/doc/stringio/getc.rdoc
+++ b/doc/stringio/getc.rdoc
@@ -12,10 +12,6 @@ Returns +nil+ if at end-of-stream:
 
 Returns characters, not bytes:
 
-  strio = StringIO.new('Привет')
-  strio.getc # => "П"
-  strio.getc # => "р"
-
   strio = StringIO.new('こんにちは')
   strio.getc # => "こ"
   strio.getc # => "ん"
diff --git a/doc/stringio/gets.rdoc b/doc/stringio/gets.rdoc
index bf72d50..a8706b0 100644
--- a/doc/stringio/gets.rdoc
+++ b/doc/stringio/gets.rdoc
@@ -19,10 +19,10 @@ With no arguments given, reads a line using the default record separator
   strio.eof? # => true
   strio.gets # => nil
 
-  strio = StringIO.new('Привет')  # Six 2-byte characters
+  strio = StringIO.new('こんにちは')  # Five 3-byte characters.
   strio.pos  # => 0
-  strio.gets # => "Привет"
-  strio.pos  # => 12
+  strio.gets # => "こんにちは"
+  strio.pos  # => 15
 
 <b>Argument +sep+</b>
 
@@ -67,11 +67,11 @@ but in other cases the position may be anywhere:
 
 The position need not be at a character boundary:
 
-  strio = StringIO.new('Привет') # Six 2-byte characters.
-  strio.pos = 2                  # At beginning of second character.
-  strio.gets # => "ривет"
-  strio.pos = 3                  # In middle of second character.
-  strio.gets # => "\x80ивет"
+  strio = StringIO.new('こんにちは')  # Five 3-byte characters.
+  strio.pos = 3                     # At beginning of second character.
+  strio.gets  # => "んにちは"
+  strio.pos = 4                     # Within second character.
+  strio.gets  # => "\x82\x93にちは"
 
 <b>Special Record Separators</b>
 
diff --git a/doc/stringio/size.rdoc b/doc/stringio/size.rdoc
index 9323adf..253c612 100644
--- a/doc/stringio/size.rdoc
+++ b/doc/stringio/size.rdoc
@@ -1,5 +1,4 @@
 Returns the number of bytes in the string in +self+:
 
   StringIO.new('hello').size     # => 5  # Five 1-byte characters.
-  StringIO.new('тест').size      # => 8  # Four 2-byte characters.
   StringIO.new('こんにちは').size # => 15 # Five 3-byte characters.
diff --git a/doc/stringio/stringio.md b/doc/stringio/stringio.md
index 8931d1c..07071ee 100644
--- a/doc/stringio/stringio.md
+++ b/doc/stringio/stringio.md
@@ -409,13 +409,15 @@ strio.pos = 24
 strio.gets   # => "Fourth line\n"
 strio.pos    # => 36
 
-strio = StringIO.new('тест') # Four 2-byte characters.
-strio.pos = 0 # At first byte of first character.
-strio.read    # => "тест"
-strio.pos = 1 # At second byte of first character.
-strio.read    # => "\x82ест"
-strio.pos = 2 # At first of second character.
-strio.read    # => "ест"
+strio = StringIO.new('こんにちは')  # Five 3-byte characters.
+strio.pos = 0  # At first byte of first character.
+strio.read     # => "こんにちは"
+strio.pos = 1  # At second byte of first character.
+strio.read     # => "\x81\x93んにちは"
+strio.pos = 2  # At third byte of first character.
+strio.read     # => "\x93んにちは"
+strio.pos = 3  # At first byte of second character.
+strio.read     # => "んにちは"
 
 strio = StringIO.new(TEXT)
 strio.pos = 15