1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index 5330b0f..aadd065 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ If an output directory is specified by `--output-dir`,
 the images are written to separate files instead.
 For instance:
 
-    mammoth document.docx --output=output-dir
+    mammoth document.docx --output-dir=output-dir
 
 #### Styles