diff --git a/astronomy/README.md b/astronomy/README.md
index 8895bf8..0e93b7f 100644
--- a/astronomy/README.md
+++ b/astronomy/README.md
@@ -309,7 +309,7 @@ from sched.sun_moon import RiSet
 
 async def turn_off_lights(rs):  # Runs every day at 00:01:00
     rs.set_day()  # Re-calculate for new daylight
-    asyncio.sleep(rs.sunrise() - 60)
+    await asyncio.sleep(rs.sunrise() - 60)
     # Actually turn them off
 
 async def main():
@@ -328,7 +328,7 @@ from sched.sched import schedule, Sequence
 from sched.sun_moon import RiSet
 
 async def turn_off_lights(t):
-    asyncio.sleep(t)
+    await asyncio.sleep(t)
     # Actually turn them off
 
 async def main():
diff --git a/astronomy/sun_moon.py b/astronomy/sun_moon.py
index c340ea3..0d4aa2b 100644
--- a/astronomy/sun_moon.py
+++ b/astronomy/sun_moon.py
@@ -254,7 +254,7 @@ class RiSet:
         st = self.sunset(1) if sun else self.moonset(1)
         if rt is None:
             if st is None:
-                t = (now % 86400) / 3600  # Time as UTC hours (float)
+                t = (now % 86400) / 3600  # Time as UTC hour of day (float)
                 return self.sin_alt(t, sun) > 0
             return st > now
         if st is None: