diff --git a/file.c b/file.c
index b0e4888f7e..ee2e87cfbc 100644
--- a/file.c
+++ b/file.c
@@ -2883,6 +2883,12 @@ unlink_internal(const char *path, VALUE pathv, void *arg)
*
* Deletes the named files, returning the number of names
* passed as arguments. Raises an exception on any error.
+ * Since the underlying implementation relies on the
+ * unlink(2)
system call, the type of
+ * exception raised depends on its error type (see
+ * https://linux.die.net/man/2/unlink) and has the form of
+ * e.g. Errno::ENOENT
.
+ *
* See also Dir::rmdir
.
*/