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-rw-r--r--doc/string/encode.rdoc6
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/string/encode.rdoc b/doc/string/encode.rdoc
index 2872887ef1..a7d400724d 100644
--- a/doc/string/encode.rdoc
+++ b/doc/string/encode.rdoc
@@ -38,3 +38,9 @@ interprets +self+ using +src_encoding+, encodes the new string using +dst_encodi
Optional keyword arguments +enc_opts+ specify encoding options;
see {Encoding Options}[rdoc-ref:encodings.rdoc@Encoding+Options].
+
+Please note that conversion from an encoding +enc+ to the same encoding
++enc+ (independent of whether +enc+ is given explicitly or implicitly)
+is a no-op, i.e. the string is simply copied without any changes, and
+no exceptions are raised, even if there are invalid bytes.
+