diff --git a/README.md b/README.md
index f532540..b969df5 100644
--- a/README.md
+++ b/README.md
@@ -48,19 +48,19 @@ The CLR stored procedure `clr_send_ics_invite` accepts the following parameters:
 | `@subject` | nvarchar(4000) | _no default_ | Mandatory parameter. A text string to be used as the meeting / e-mail's subject. |
 | `@body` | nvarchar(4000) | _null_ | Optional parameter. A text string to be used as the e-mail's HTML body. |
 | `@location` | nvarchar(4000) | _null_ | Optional parameter. Sets the location for the meeting. |
-| `@start_time_utc` | datetime | _null_ | Optional parameter. Sets the start time (in UTC) of the meeting. If not specified, by default will be set as **UTC now + 5 hours**. |
-| `@end_time_utc` | datetime | _null_ | Optional parameter. Sets the end time (in UTC) of the meeting. If not specified, by default will be set as **`@start_time_utc` + 1 hour**. |
-| `@timestamp_utc` | datetime | _null_ | Optional parameter. Sets the DTSTAMP section of the iCal (usually used for consistent updating of meeting invites). If not specified, by default will be set as **UTC now**. |
-| `@smtp_server` | nvarchar(4000) | _null_ | Optional parameter. Sets the SMTP host name to be used for sending the e-mail. If not specified, by default will be set as **"localhost"**. |
+| `@start_time_utc` | datetime | _UTC now + 5 hours_ | Optional parameter. Sets the start time (in UTC) of the meeting. If not specified, by default will be set as **UTC now + 5 hours**. |
+| `@end_time_utc` | datetime | _@start_time_utc + 1 hour_ | Optional parameter. Sets the end time (in UTC) of the meeting. If not specified, by default will be set as **`@start_time_utc` + 1 hour**. |
+| `@timestamp_utc` | datetime | _UTC now_ | Optional parameter. Sets the DTSTAMP section of the iCal (usually used for consistent updating of meeting invites). If not specified, by default will be set as **UTC now**. |
+| `@smtp_server` | nvarchar(4000) | _localhost_ | Optional parameter. Sets the SMTP host name to be used for sending the e-mail. If not specified, by default will be set as **"localhost"**. |
 | `@port` | int | _25_ | Optional parameter. Sets the SMTP port to be used for sending the e-mail. If not specified, by default will be set as **25**. |
 | `@use_ssl` | bit | _0_ | Optional parameter. Sets whether to use SSL authentication for the SMTP server. If not specified, by default will be set as **0 (false)**. |
-| `@username` | nvarchar(4000) | _null_ | Optional parameter. Sets the username to use when authenticating against the SMTP server. If not specified, by default the **current Network Credentials** will be used (of the SQL Server service). |
-| `@password` | nvarchar(4000) | _null_ | Optional parameter. Sets the password to use when authenticating against the SMTP server. Only used when `@username` is also specified. By default, will use **empty password**. |
+| `@username` | nvarchar(4000) | _null (use current Network Credentials)_ | Optional parameter. Sets the username to use when authenticating against the SMTP server. If not specified, by default the **current Network Credentials** will be used (of the SQL Server service). |
+| `@password` | nvarchar(4000) | _empty password_ | Optional parameter. Sets the password to use when authenticating against the SMTP server. Only used when `@username` is also specified. By default, will use **empty password**. |
 | `@use_reminder` | bit | _1_ | Optional parameter. Sets whether to set a reminder for the meeting. By default is set to **1 (true)**. |
 | `@reminder_minutes` | int | _15_ | If `@use_reminder` is enabled, this parameter will be used for setting the reminder time in minutes. By default is set to **15**. |
 | `@require_rsvp` | bit | _0_ | If set to 0 (false), then participants will not be required to respond with RSVP, and their participation is automatically set as ACCEPTED. If set to 1 (true), then participants will be required to respond with RSVP, and their participation is automatically set as NEEDS-ACTION. By default set to **0 (false)**. |
 | `@cancel_event_identifier` | uniqueidentifier | _null_ | You may specify a value for this parameter, if you want to cancel an event that you've already sent. Use the corresponding event's identifier. |
-| `@event_identifier` | uniqueidentifier | _null_ | Output parameter. Returns the event's GUID, which can later be used for cancellation. |
+| `@event_identifier` | uniqueidentifier | _null_ | Output parameter. Returns the event's GUID, which can later be used for cancellation. If `@cancel_event_identifier` was specified, the same GUID will be returned. |
 | `@suppress_info_messages` | bit | _0_ | If set to 0, an informational message will be printed upon successful delivery of the invitation ( ex. "Mail Sent. Event Identifier: 1234-1234-1234-1234" ). If set to 1, this message will not be printed. By default is set to **0 (false)**. |
 
 ## License and copyright