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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -8,5 +8,21 @@ A Google Chrome browser extension that rotates the [GitHub](https://github.com)
 To install the extension, open the Extensions window in Chrome and click 'Load unpacked extension…". In the file browser select the directory of this project.
 
 
+# Help! Mouse-dragging is all weird!
+The graph may be rotated, but the controls aren't. Here's a handy translation key.
+
+## Mouse dragging
+UP: graph moves RIGHT
+DOWN: graph moves LEFT
+LEFT: graph moves UP
+RIGHT: graph moves DOWN
+
+## Arrow keys (keyboard)
+UP: graph moves LEFT
+DOWN: graph moves RIGHT
+LEFT: graph moves UP
+RIGHT: graph moves DOWN
+
+
 # License
 No More GitHub Neck Cricks is licensed under the MIT License. See the included LICENSE file.