diff --git a/README.md b/README.md
index 9dc79c6..8400f5f 100644
--- a/README.md
+++ b/README.md
@@ -216,6 +216,12 @@ In ERB templates, you can use the following comment format:
 <%# locals: () %>
 ```
 
+In slim templates, the comment format looks like this:
+
+```
+//# locals: ()
+```
+
 In string templates, it is a little ackward, but still possible (note that the
 closing `}` goes on a separate line: