diff --git a/src/core/os.c b/src/core/os.c
index 278af1ef..363505f6 100644
--- a/src/core/os.c
+++ b/src/core/os.c
@@ -2037,25 +2037,25 @@ static const JanetReg os_cfuns[] = {
              "mode should be a file mode as passed to os/chmod, but only if the create flag is given. "
              "The default mode is 8r666. "
              "Allowed flags are as follows:\n\n"
-             "\t:r - open this file for reading\n"
-             "\t:w - open this file for writing\n"
-             "\t:c - create a new file (O_CREATE)\n"
-             "\t:e - fail if the file exists (O_EXCL)\n"
-             "\t:t - shorten an existing file to length 0 (O_TRUNC)\n\n"
-             "Posix only flags:\n"
-             "\t:a - append to a file (O_APPEND)\n"
-             "\t:x - O_SYNC\n"
-             "\t:C - O_NOCTTY\n\n"
-             "Windows only flags:\n"
-             "\t:R - share reads (FILE_SHARE_READ)\n"
-             "\t:W - share writes (FILE_SHARE_WRITE)\n"
-             "\t:D - share deletes (FILE_SHARE_DELETE)\n"
-             "\t:H - FILE_ATTRIBUTE_HIDDEN\n"
-             "\t:O - FILE_ATTRIBUTE_READONLY\n"
-             "\t:F - FILE_ATTRIBUTE_OFFLINE\n"
-             "\t:T - FILE_ATTRIBUTE_TEMPORARY\n"
-             "\t:d - FILE_FLAG_DELETE_ON_CLOSE\n"
-             "\t:b - FILE_FLAG_NO_BUFFERING\n")
+             "  * :r - open this file for reading\n"
+             "  * :w - open this file for writing\n"
+             "  * :c - create a new file (O_CREATE)\n"
+             "  * :e - fail if the file exists (O_EXCL)\n"
+             "  * :t - shorten an existing file to length 0 (O_TRUNC)\n\n"
+             "Posix only flags:\n\n"
+             "  * :a - append to a file (O_APPEND)\n"
+             "  * :x - O_SYNC\n"
+             "  * :C - O_NOCTTY\n\n"
+             "Windows only flags:\n\n"
+             "  * :R - share reads (FILE_SHARE_READ)\n"
+             "  * :W - share writes (FILE_SHARE_WRITE)\n"
+             "  * :D - share deletes (FILE_SHARE_DELETE)\n"
+             "  * :H - FILE_ATTRIBUTE_HIDDEN\n"
+             "  * :O - FILE_ATTRIBUTE_READONLY\n"
+             "  * :F - FILE_ATTRIBUTE_OFFLINE\n"
+             "  * :T - FILE_ATTRIBUTE_TEMPORARY\n"
+             "  * :d - FILE_FLAG_DELETE_ON_CLOSE\n"
+             "  * :b - FILE_FLAG_NO_BUFFERING\n")
     },
     {
         "os/pipe", os_pipe,