1 files changed, 20 insertions, 0 deletions
diff --git a/doc/string/force_encoding.rdoc b/doc/string/force_encoding.rdoc
new file mode 100644
index 0000000000..fd9615caaa
--- /dev/null
+++ b/doc/string/force_encoding.rdoc
@@ -0,0 +1,20 @@
+Changes the encoding of +self+ to +encoding+,
+which may be a string encoding name or an Encoding object;
+returns self:
+
+  s = 'łał'
+  s.bytes                   # => [197, 130, 97, 197, 130]
+  s.encoding                # => #<Encoding:UTF-8>
+  s.force_encoding('ascii') # => "\xC5\x82a\xC5\x82"
+  s.encoding                # => #<Encoding:US-ASCII>
+
+Does not change the underlying bytes:
+
+  s.bytes                   # => [197, 130, 97, 197, 130]
+
+Makes the change even if the given +encoding+ is invalid
+for +self+ (as is the change above):
+
+  s.valid_encoding?                 # => false
+  s.force_encoding(Encoding::UTF_8) # => "łał"
+  s.valid_encoding?                 # => true