diff --git a/doc/pascalprogramming.md b/doc/pascalprogramming.md
index d221f55..53b7dff 100644
--- a/doc/pascalprogramming.md
+++ b/doc/pascalprogramming.md
@@ -39,6 +39,16 @@ The _in_ operator also works for linear arrays, so the _if_ statement will have
 
 Note that the array _in_ operator will be more inefficient for larger ranges (i.e. `'A'..'z'`), but more efficient for sparse sets (i.e. `'A','z'`).
 
+## Break and Continue Statements
+
+Wirth Pascal has no statement to exit a loop. Other Pascal dialects have the _break_ and _continue_ statements to exit the loop or skip to the next iteration.
+
+Tridora-Pascal only supports the _break_ statement at the moment.
+
+## Exit Statement
+The _exit_ statement can be used to exit the current procedure or function. If it is a function, the return value of the function is undefined if _exit_ is
+used before a return value is assigned.
+
 ## I/O
 I/O handling in Tridora Pascal is mostly compatible with other Pascal dialects when reading/writing simple variables from/to the console. There are big differences when opening/reading/writing files explicitly.
 
@@ -113,6 +123,22 @@ begin
 end;
 ```
 
+Possible error codes from _IOResult_ are:
+|Value|Constant Identifier| Description| Notes |
+|---|-------------------|------------|-------|
+| 0 | IONoError 	    | no error   |  |
+| 1 | IOFileNotFound    | file not found |  |
+| 2 | IOVolNotFound     | volume not found |  |	
+| 3 | IOPathInvalid     | path invalid |  |
+| 4 | IOFileExists      | file already exists |  |
+| 5 | IOFileClosed      | file closed |  |
+| 6 | IOSeekInvalid     | seek invalid |  |
+| 7 | IONoSpace         | no space     |  |
+| 8 | IOReadOnly        | file is readonly |  |
+| 9 | IOInvalidOp       | invalid operation |  |
+| 10 | IOInvalidFormat   | invalid format | when parsing numbers with _read_ |
+| 11 | IOUserIntr        | interrupted by user | program terminated by ^C, not visible from _IOResult_ |
+
 ### Read, Readln and Line Input
 In Turbo Pascal, using _read_ (and _readln_) from the console always waits until a complete line has been entered.
 Tridora-Pascal handles this like UCSD-Pascal, that is, it immediately
@@ -136,6 +162,12 @@ var c:char;
 
 ```
 
+## Labels
+
+In Wirth Pascal, labels must be numbers. Other Pascal dialects also allow normal identifiers (i.e. start with letters then letters and digits).
+
+Tridora-Pascal only allows identifiers as labels.
+
 ## Compiler Directives
 
 Tridora-Pascal understands a small number of compiler directives which are introduced as usual with a comment and a dollar-sign. Both comment styles can be used.