CURLOPT_READFUNCTION.3: the callback 'size' arg is always 1
Reported-by: Brian Green
Fixes #10328
Closes #10355
diff --git a/docs/libcurl/opts/CURLOPT_READFUNCTION.3 b/docs/libcurl/opts/CURLOPT_READFUNCTION.3
index 964a43e..ee20e8b 100644
--- a/docs/libcurl/opts/CURLOPT_READFUNCTION.3
+++ b/docs/libcurl/opts/CURLOPT_READFUNCTION.3
@@ -40,7 +40,7 @@
in order to send it to the peer - like if you ask it to upload or post data to
the server. The data area pointed at by the pointer \fIbuffer\fP should be
filled up with at most \fIsize\fP multiplied with \fInitems\fP number of bytes
-by your function.
+by your function. \fIsize\fP is always 1.
Set the \fIuserdata\fP argument with the \fICURLOPT_READDATA(3)\fP option.
