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-rw-r--r--include/curl/curl.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/curl/curl.h b/include/curl/curl.h
index 3f5c49a27..155913af4 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -177,7 +177,9 @@ typedef int (*curl_progress_callback)(void *clientp,
/* Tests have proven that 20K is a very bad buffer size for uploads on
Windows, while 16K for some odd reason performed a lot better.
We do the ifndef check to allow this value to easier be changed at build
- time for those who feel adventurous. */
+ time for those who feel adventurous. The practical minimum is about
+ 400 bytes since libcurl uses a buffer of this size as a scratch area
+ (unrelated to network send operations). */
#define CURL_MAX_WRITE_SIZE 16384
#endif