diff --git a/README.md b/README.md
index 58c0636..1c3ad35 100644
--- a/README.md
+++ b/README.md
@@ -308,14 +308,13 @@ maintenance and allows for more easy customization.
    enhancements, etc.  This is a base desktop system, with some development
    tools installed.
 
- - **Stage 4** - Raspbian system meant to fit on a 4GB card.  More development
+ - **Stage 4** - Normal Raspbian image. System meant to fit on a 4GB card.  More development
    tools, an email client, learning tools like Scratch, specialized packages
    like sonic-pi, system documentation, office productivity, etc.  This is the
    stage that installs all of the things that make Raspbian friendly to new
    users.
 
- - **Stage 5** - The official Raspbian Desktop image. Right now only adds
-   Mathematica.
+ - **Stage 5** - The Raspbian Full image.
 
 ### Stage specification
 
@@ -323,7 +322,7 @@ If you wish to build up to a specified stage (such as building up to stage 2
 for a lite system), place an empty file named `SKIP` in each of the `./stage`
 directories you wish not to include.
 
-Then add an empty file named `SKIP_IMAGES` to `./stage4` (if building up to stage 2) or
+Then add an empty file named `SKIP_IMAGES` to `./stage4` and `./stage5` (if building up to stage 2) or
 to `./stage2` (if building a minimal system).
 
 ```bash
diff --git a/build.sh b/build.sh
index db5177a..3b02fce 100755
--- a/build.sh
+++ b/build.sh
@@ -305,7 +305,7 @@ for EXPORT_DIR in ${EXPORT_DIRS}; do
 	fi
 done
 
-if [ -x postrun.sh ]; then
+if [ -x ${BASE_DIR}/postrun.sh ]; then
 	log "Begin postrun.sh"
 	cd "${BASE_DIR}"
 	./postrun.sh