aboutsummaryrefslogtreecommitdiffstats
path: root/system/doc/design_principles/fsm.xml
diff options
context:
space:
mode:
Diffstat (limited to 'system/doc/design_principles/fsm.xml')
-rw-r--r--system/doc/design_principles/fsm.xml5
1 files changed, 5 insertions, 0 deletions
diff --git a/system/doc/design_principles/fsm.xml b/system/doc/design_principles/fsm.xml
index 7cdd62057b..c3e9027274 100644
--- a/system/doc/design_principles/fsm.xml
+++ b/system/doc/design_principles/fsm.xml
@@ -308,6 +308,11 @@ terminate(normal, _StateName, _StateData) ->
handle_info({'EXIT', Pid, Reason}, StateName, StateData) ->
..code to handle exits here..
{next_state, StateName1, StateData1}.</code>
+ <p>The code_change method also has to be implemented.</p>
+ <code type="none">
+code_change(OldVsn, StateName, StateData, Extra) ->
+ ..code to convert state (and more) during code change
+ {ok, NextStateName, NewStateData}</code>
</section>
</chapter>