diff --git a/README.md b/README.md
index afe8c551cff6fd4b88565fa8fe9890d0c13d8255..d78b625592cc8b50c7f43e2f73c56ee082d66d88 100644
--- a/README.md
+++ b/README.md
@@ -54,10 +54,15 @@
 * open holiday ics파일
 * 개선한 점 : 한국 여행자 등에게 도움이 될 수 있도록 한국어로 번역
 
+* google GPS API 사용법
+* http://git.ajou.ac.kr/open-source-2018-spring/Google_GPS_API_Kotlin
+
 * python - ics parser
 * https://github.com/oblique63/Python-GoogleCalendarParser
+
 * 기존 파이썬 ics parser -> kotlin ics parser
 
+* googleGPS API 사용법 제시
 ### License
 
 * Apache 2.0 License
diff --git a/app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Parser.kt b/app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Parser.kt
index f70989897094fbf2236519047c5e318628df364d..11fc1a411a0d81bb2a1f0e29ad0111d27b9df273 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Parser.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Parser.kt
@@ -11,7 +11,7 @@ import org.joda.time.DateTimeZone
 import org.joda.time.format.DateTimeFormat
 
 class Parser {
-    // from RRULE:FREQ=DAILY;COUNT=5 to Daily, 5x...
+    
     fun parseRepeatInterval(fullString: String, startTS: Int): RepeatRule {
         val parts = fullString.split(";")
         var repeatInterval = 0
@@ -186,7 +186,6 @@ class Parser {
         else -> SU
     }
 
-    // from P0DT1H5M0S to 3900 (seconds)
     fun parseDurationSeconds(duration: String): Int {
         val weeks = getDurationValue(duration, "W")
         val days = getDurationValue(duration, "D")