Add note that convertToHtml returns a promise

1 files changed, 2 insertions, 0 deletions

diff --git a/README.md b/README.md
index 354f66d..b20eb01 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,8 @@ mammoth.convertToHtml({path: "path/to/document.docx"})
     .done();
 ```
 
+Note that `mammoth.convertToHtml` returns a [promise](http://promises-aplus.github.io/promises-spec/).
+
 ### Custom style map
 
 By default,