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+# Word Per Minute (WPM) Calculcation
+
+The WPM feature uses time between keystrokes to compute a rolling average words
+per minute rate and makes this available for various uses.
+
+Enable the WPM system by adding this to your `rules.mk`:
+
+    WPM_ENABLE = yes
+
+For split keyboards using soft serial, the computed WPM
+score will be available on the master AND slave half.
+
+## Public Functions
+
+`uint8_t get_current_wpm(void);`
+This function returns the current WPM as an unsigned integer.
+
+
+## Customized keys for WPM calc
+
+By default, the WPM score only includes letters, numbers, space and some
+punctuation.  If you want to change the set of characters considered as part of
+the WPM calculation, you can implement `wpm_keycode_user(uint16_t keycode)`
+and return true for any characters you would like included in the calculation,
+or false to not count that particular keycode.