[PATCH 1/3] SQUASH? Mention that `snapshot::buf` can be NULL for empty files

[Michael Haggerty]

Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
---
 refs/packed-backend.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/refs/packed-backend.c b/refs/packed-backend.c
index 01a13cb817..f20f05b4df 100644
--- a/refs/packed-backend.c
+++ b/refs/packed-backend.c
@@ -69,11 +69,11 @@ struct snapshot {
 
        /*
         * The contents of the `packed-refs` file. If the file was
-        * already sorted, this points at the mmapped contents of the
-        * file. If not, this points at heap-allocated memory
-        * containing the contents, sorted. If there were no contents
-        * (e.g., because the file didn't exist), `buf` and `eof` are
-        * both NULL.
+        * already sorted and if mmapping is allowed, this points at
+        * the mmapped contents of the file. If not, this points at
+        * heap-allocated memory containing the contents, sorted. If
+        * there were no contents (e.g., because the file didn't exist
+        * or was empty), `buf` and `eof` are both NULL.
         */
        char *buf, *eof;
 
-- 
2.14.2