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-rw-r--r--lib/kernel/doc/src/error_handler.xml13
1 files changed, 13 insertions, 0 deletions
diff --git a/lib/kernel/doc/src/error_handler.xml b/lib/kernel/doc/src/error_handler.xml
index 610b65f0a2..769a869ffa 100644
--- a/lib/kernel/doc/src/error_handler.xml
+++ b/lib/kernel/doc/src/error_handler.xml
@@ -62,6 +62,19 @@
<c>'$handle_undefined_function'(</c><anno>Function</anno>,
<anno>Args</anno>).
</p>
+ <warning>
+ <p>Defining <c>'$handle_undefined_function'/2</c> in
+ ordinary application code is highly discouraged. It is very
+ easy to make subtle errors that can take a long time to
+ debug. Furthermore, none of the tools for static code
+ analysis (such as Dialyzer and Xref) supports the use of
+ <c>'$handle_undefined_function'/2</c> and no such support
+ will be added. Only use this function after having carefully
+ considered other, less dangerous, solutions. One example of
+ potential legitimate use is creating stubs for other
+ sub-systems during testing and debugging.
+ </p>
+ </warning>
<p>Otherwise an <c>undef</c> exception will be raised.</p>
</desc>
</func>