-.TH IMAGEX "1" "November 2012" "imagex (wimlib) wimlib @VERSION@" "User Commands"
+.TH IMAGEX "1" "December 2012" "imagex (wimlib) wimlib @VERSION@" "User Commands"
.SH NAME
imagex-capture, imagex-append \- Capture a WIM image from a directory tree
stream chunk size of 32768. The only WIMs I've seen that are different from
this are some pre-Vista WIMs that had a different version number.
-Unless --rebuild is specified, aborting an \fBimagex append\fR command mid-way
-through has a small chance of corrupting the WIM file. However, a precaution is
-taken against this, so it should be very unlikely. In the event of an aborted
-\fBimagex append\fR, \fBimagex optimize\fR may be run to remove extra data that
-may have been partially appended to the physical WIM file but not yet
-incorporated into the structure of the WIM.
+Unless \fB--rebuild\fR is specified, aborting an \fBimagex append\fR command
+mid-way through has a small chance of corrupting the WIM file. However, a
+precaution is taken against this, so it should be very unlikely. In the event
+of an aborted \fBimagex append\fR, \fBimagex optimize\fR may be run to remove
+extra data that may have been partially appended to the physical WIM file but
+not yet incorporated into the structure of the WIM.
+
+Capturing or appending an image happens in two main phases: (1) scanning the
+directory or NTFS volume to checksum all the files and determine the streams to
+be written, and (2) writing the new streams to the WIM file. Streams are not
+stored in memory after (1), since there could easily be gigabytes of data;
+instead, they are read again during step (2); however, duplicate streams in the
+image, and streams already existing in any other image in the WIM, are not read
+again. In the future, it may be possible to introduce the ability to capture an
+image with reading each file only one time, although this mode would have some
+limitations--- for example, a stream might be compressed only to be thrown away
+as a duplicate once it's been checksummed.
.SH EXAMPLES
Create a new WIM 'mywim.wim' from the directory 'somedir', using LZX compression and