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-rw-r--r--system/doc/design_principles/gen_server_concepts.xml5
1 files changed, 5 insertions, 0 deletions
diff --git a/system/doc/design_principles/gen_server_concepts.xml b/system/doc/design_principles/gen_server_concepts.xml
index 8131c47a69..231333da0e 100644
--- a/system/doc/design_principles/gen_server_concepts.xml
+++ b/system/doc/design_principles/gen_server_concepts.xml
@@ -264,6 +264,11 @@ terminate(normal, State) ->
handle_info({'EXIT', Pid, Reason}, State) ->
..code to handle exits here..
{noreply, State1}.</code>
+ <p>The code_change method also has to be implemented.</p>
+ <code type="none">
+code_change(OldVsn, State, Extra) ->
+ ..code to convert state (and more) during code change
+ {ok, NewState}.</code>
</section>
</chapter>