diff --git a/README.md b/README.md
index 512aa7f..e4d2dd0 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,8 @@ API calls.
       Note that by default Username is preferred over UID
     --extract-prefer-gid : Prefer GID over Group when extracting
       Note that by default Group is preferred over UID
+    --map-user <UID/Uname>:<UID/Uname> : Maps a UID/Username to UID/Username
+    --map-group <GID/Gname>:<GID/Gname> : Maps a GID/Group to GID/Group
     --force-file-permissions <3-octal-values> : Force set permissions for files on archive creation/extraction
       Must be three octal characters like "755" or "440"
     --force-dir-permissions <3-octal-values> : Force set permissions for directories on archive creation/extraction
@@ -52,6 +54,7 @@ API calls.
     -- : specifies remaining arguments are files to archive/extract
     If creating archive file, remaining args specify files to archive.
     If extracting archive file, remaining args specify files to extract.
+    Note that permissions/ownership/remapping is saved when archiving, but when extracting they are only preserved when extracting as root!
 
 Note that `--compressor` and `--decompressor` cmds must accept data from stdin
 and return processed data to stdout.
diff --git a/src/parser.c b/src/parser.c
index 3223982..133aa52 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -243,6 +243,10 @@ void simple_archiver_print_usage(void) {
   fprintf(
       stderr,
       "If extracting archive file, remaining args specify files to extract.\n");
+  fprintf(stderr,
+          "Note that permissions/ownership/remapping is saved when archiving, "
+          "but when extracting they are only preserved when extracting as root!"
+          "\n");
 }
 
 SDArchiverParsed simple_archiver_create_parsed(void) {