diff --git a/README.md b/README.md
index fc05724..39188b4 100644
--- a/README.md
+++ b/README.md
@@ -1064,9 +1064,10 @@ sh.ls('/dir', { recursive: true }, function(err, entries) {
#### sh.exec(path, [options], callback)
-Attempts to execute the .js command located at `path`. Such commands
-should be written so as to assume the existence of 3 global variables,
-which will be defined at runtime:
+Attempts to execute the .js command located at `path`. The `sh.exec` method
+enables apps to install larger programs into the file system and run them
+later without having to re-download. Such commands should be written so as
+to assume the existence of 3 global variables, which will be defined at runtime:
* `options` -