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-rw-r--r--docs/USERGUIDE.md7
1 files changed, 6 insertions, 1 deletions
diff --git a/docs/USERGUIDE.md b/docs/USERGUIDE.md
index 32f31dd..3c0e30c 100644
--- a/docs/USERGUIDE.md
+++ b/docs/USERGUIDE.md
@@ -618,8 +618,13 @@ bell, with a progress bar, the current rate, and a cancel button each:
Any member can take a whole folder: **⋮ → Download as zip** on the folder's row.
The archive is built in the browser as the files arrive and written straight to
-disk, so a 40 GB folder costs 40 GB of disk and a few megabytes of memory.
+disk, so it costs disk space and only a few megabytes of memory.
+- **A folder has to be 512 MB or smaller.** Larger than that and the button
+ refuses, naming the folder's size — take a subfolder at a time, or the files
+ individually. This is a deliberate cap, not a technical one: the writer would
+ happily stream a hundred gigabytes. Selecting several folders at once applies
+ it to each of them separately, so one oversized folder does not stop the rest.
- Nothing is compressed. Group content is video, images and archives — already
compressed — so deflating would spend CPU on every byte to save nothing, in the
same thread that is decrypting.