diff --git a/README.md b/README.md
index 9ad5fa2..7fc35b1 100644
--- a/README.md
+++ b/README.md
@@ -107,7 +107,7 @@ This computation requires the following values
   * bpm_sample_interval
   * bpm_delay
   * bpm
-  * pttl_delta : Double the bpm_sample_interval minus (-) the PTTL value of the bpm key in redis minus
+  * pttl_delta : Double the bpm_sample_interval minus (-) the PTTL value of the bpm key in redis.
   * last_beat : last beat time in sample
 
 Redis_latency times are not considered here, but could be