diff --git a/functions.html b/functions.html
index 4f36678..dfe6364 100644
--- a/functions.html
+++ b/functions.html
@@ -1412,6 +1412,46 @@ duration()
duration(6*52*7*24*60*60*1000 + 2*31*24*60*60*1000,4) |
["6 years", "2 months"] |
+
+ | duration(0,["hours"]) |
+ ["0 hours"] |
+
+
+ | duration(1,["hours"]) |
+ [“0 hours”] |
+
+
+ | duration(60*60*1000,["weeks","hours","minutes"]) |
+ ["1 hour"] |
+
+
+ | duration(3*7*24*60*60*1000,["hours","minutes"]) |
+ ["504 hours"] |
+
+
+ | duration(3*7*24*60*60*1000,["minutes","hours"]) |
+ ["504 hours"] |
+
+
+ | duration(60*60*1000+1,["hours","ms"]) |
+ ["1 hour", "1 ms"] |
+
+
+ | duration(1+60*60*1000+60,["hours","ms"]) |
+ ["1 hour", "61 ms"] |
+
+
+ | duration(1,["seconds","days","hours"]) |
+ ["0 seconds"] |
+
+
+ | duration(1,["seconds","ms","days","hours"]) |
+ ["1 ms"] |
+
+
+ | duration(60*60*1000+2000,["hours","ms"]) |
+ ["1 hours", "2000 ms"] |
+