Improve os.getFileSize documentation to specify the unit.

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/pure/os.nim b/lib/pure/os.nim
index 07670c5da..39cdf6d81 100644
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -1616,7 +1616,8 @@ proc sleep*(milsecs: int) {.rtl, extern: "nos$1", tags: [TimeEffect].} =
 
 proc getFileSize*(file: string): BiggestInt {.rtl, extern: "nos$1",
   tags: [ReadIOEffect].} =
-  ## returns the file size of `file`. Can raise ``OSError``.
+  ## returns the file size of `file` (in bytes). An ``OSError`` exception is
+  ## raised in case of an error.
   when defined(windows):
     var a: WIN32_FIND_DATA
     var resA = findFirstFile(file, a)