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-rw-r--r--lib-src/asset-directory-tool.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/lib-src/asset-directory-tool.c b/lib-src/asset-directory-tool.c
index 239ab083b66..99c954a3922 100644
--- a/lib-src/asset-directory-tool.c
+++ b/lib-src/asset-directory-tool.c
@@ -45,7 +45,12 @@ along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
the first file or directory, a NULL byte and an unsigned int
indicating the offset from the start of the file to the start of
the next sibling. Following that is a list of subdirectories or
- files in the same format. The long is stored LSB first. */
+ files in the same format. The long is stored LSB first.
+
+ Directories can be distinguished from ordinary files through the
+ last bytes of their file names (immediately previous to their
+ terminating NULL bytes), which are set to the directory separator
+ character `/'. */