1 files changed, 1 insertions, 0 deletions
diff --git a/file.c b/file.c
index 1adbe76802..48c978ed36 100644
--- a/file.c
+++ b/file.c
@@ -4237,6 +4237,7 @@ ruby_enc_find_extname(const char *name, long *len, rb_encoding *enc)
  *
  *     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("test")            #=> ""
  *     File.extname(".profile")        #=> ""