diff --git a/lib/pure/os.nim b/lib/pure/os.nim
index c3349beb3b7b9..58a565c7a3a5e 100644
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -954,13 +954,15 @@ proc getTempDir*(): string {.rtl, extern: "nos$1",
   tags: [ReadEnvEffect, ReadIOEffect].} =
   ## Returns the temporary directory of the current user for applications to
   ## save temporary files in.
-  ## 
-  ## On Windows, it calls [GetTempPath](https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-gettemppathw)
-  ## On Posix based platforms, it will check `TMPDIR`, `TEMP`, `TMP` and `TEMPDIR` environment variables.
+  ##
+  ## On Windows, it calls [GetTempPath](https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-gettemppathw).
+  ## On Posix based platforms, it will check `TMPDIR`, `TEMP`, `TMP` and `TEMPDIR` environment variables in order.
   ## On all platforms, `/tmp` will be returned if the procs fails.
   ##
   ## You can override this implementation
   ## by adding `-d:tempDir=mytempname` to your compiler invocation.
+  ## 
+  ## **Note:** This proc does not check whether the returned path exists.
   ##
   ## See also:
   ## * `getHomeDir proc <#getHomeDir>`_