diff --git a/docs/commands.md b/docs/commands.md
index 961408c..c9c374f 100644
--- a/docs/commands.md
+++ b/docs/commands.md
@@ -504,7 +504,7 @@ $ ma up [flags]
 |Name|Aliases|EnvVars|Description|
 |-|-|-|-|
 |album|a||the album to which image files will be uploaded|
-|ext|x||the set of file extensions suitable for uploading|
+|ext|e||the set of supported file extensions|
 |dryrun|n||prepare to upload but don't actually do it|
 |mirror|||mirror the local filesystem with a SmugMug gallery|
 |0|||read null byte terminated strings from stdin|
diff --git a/up.go b/up.go
index 584c369..9fa2d69 100644
--- a/up.go
+++ b/up.go
@@ -275,8 +275,8 @@ func CommandUpload() *cli.Command {
 			},
 			&cli.StringSliceFlag{
 				Name:     "ext",
-				Usage:    "the set of file extensions suitable for uploading",
-				Aliases:  []string{"x"},
+				Usage:    "the set of supported file extensions",
+				Aliases:  []string{"e"},
 				Required: false,
 				Value:    cli.NewStringSlice(".jpg", ".jpeg"),
 			},