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-rw-r--r--NEWS4
-rw-r--r--file.c5
2 files changed, 6 insertions, 3 deletions
diff --git a/NEWS b/NEWS
index e8fdfe0cf5..aadb1224c9 100644
--- a/NEWS
+++ b/NEWS
@@ -194,8 +194,8 @@ Fiber::
File::
Modified method::
- * File.extname now returns a dot string at a name ending with a
- dot. [Bug #15267]
+ * File.extname now returns a dot string at a name ending with a dot on
+ non-Windows platforms. [Bug #15267]
File.extname("foo.") #=> "."
diff --git a/file.c b/file.c
index d10aeaa3e0..17881c065d 100644
--- a/file.c
+++ b/file.c
@@ -4789,10 +4789,13 @@ ruby_enc_find_extname(const char *name, long *len, rb_encoding *enc)
* An empty string will also be returned when the period is the last character
* in +path+.
*
+ * On Windows, trailing dots are truncated.
+ *
* File.extname("test.rb") #=> ".rb"
* File.extname("a/b/d/test.rb") #=> ".rb"
* File.extname(".a/b/d/test.rb") #=> ".rb"
- * File.extname("foo.") #=> "."
+ * File.extname("foo.") #=> "" on Windows
+ * File.extname("foo.") #=> "." on non-Windows
* File.extname("test") #=> ""
* File.extname(".profile") #=> ""
* File.extname(".profile.sh") #=> ".sh"