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diff --git a/examples/stm32/l1/stm32l-discovery/button-irq-printf/README b/examples/stm32/l1/stm32l-discovery/button-irq-printf/README
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+++ b/examples/stm32/l1/stm32l-discovery/button-irq-printf/README
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+* Counts how long the user button was held down (in ms)
+* Uses one free running counter plus EXTI as an ugly input capture
+115200@8n1 console on PA2 (tx only)
+