diff --git a/README.md b/README.md
index fd20a50..b2f0ecf 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Visit https://jlfwong.github.io/speedscope/, then either browse to find a profil
 
 ## Supported file formats:
 1. The folded stack format output by the FlameGraph scripts do: https://github.com/brendangregg/FlameGraph#2-fold-stacks. Example: https://github.com/jlfwong/speedscope/blob/master/sample/perf-vertx-stacks-01-collapsed-all.txt
-2. The timeline format output by Chrome developer tools: https://developers.google.com/web/tools/chrome-devtools/evaluate-performance/reference#save. **NOTE**: You must append a `.json` extension. Example: https://github.com/jlfwong/speedscope/blob/master/sample/chrome-timeline.json
+2. The timeline format output by Chrome developer tools: https://developers.google.com/web/tools/chrome-devtools/evaluate-performance/reference#save.
 3. The `.cpuprofile` format output by Chrome developer tools JavaScript profiler, useful for viewing flamecharts generated by Node.js applications: https://medium.com/@paul_irish/debugging-node-js-nightlies-with-chrome-devtools-7c4a1b95ae27
 
 ## Views
@@ -42,6 +42,7 @@ Once a profile has loaded, the main view is split into two: the top area is the
 - Scroll on either axis to pan around
 - Pinch to zoom
 - Hold Cmd+Scroll to zoom
+- Double click on a frame to fit the viewport to it
 
 ### Keyboard Navigation
 - `+`: zoom in