diff --git a/README.md b/README.md
index ede6324..4bcecd3 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,16 @@ http_tools.sh
 md_tools.sh
 ```
 
+## Overview
+
+Bash script ``cget.sh`` retrieves and caches HTTP resources on disk. A previously cached resource is retrieved via HTTP Conditional GET [RFC 7232]. If the web server responds with HTTP 200 OK, the resource is cached and written to stdout. If the web server responds with 304 Not Modified, the cached resource is written to stdout instead.
+
+See the inline help file for details:
+
+```Shell
+$ $BIN_DIR/cget.sh -h
+```
+
 ## Compatibility
 
 Shell scripts are compatible with both GNU/Linux and Mac OS. XSLT scripts are written in XSLT 1.0.