README: Improve instructions for custom downloads

Be clear about where to write custom code.

1 files changed, 6 insertions, 3 deletions

diff --git a/README.md b/README.md
index 3e5fda6..aaec756 100644
--- a/README.md
+++ b/README.md
@@ -110,15 +110,18 @@ chmod +x /usr/local/sbin/install-kernel
 
 ### Customizing Update Downloads
 
-You can add a section to the [script](src/slack-autoupdate) to pull updates
-using different tools or sources.  The sections use the following structure,
-and some examples are provided in the [recipes](src/recipes) directory.
+You can add a section to the [cron script](./src/slack-autoupdate) to pull
+updates using different tools or sources. The sections use the following
+structure.  Place the code within the 'if-then' block just after the 'exec'.
+Examples may be found in the [recipes](./src/recipes) directory.
 
 ```
 if ! OUTPUT="$(
   # Redirect error output to standard output.
   exec 2>&1
 
+  # Your update code goes here.
+  #
   # Download updates into $STAGING_DIR.
   #
   # On failure the command output is appended to the error file.