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-rw-r--r--lib/stdlib/doc/src/re.xml6
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/stdlib/doc/src/re.xml b/lib/stdlib/doc/src/re.xml
index 4d2a0e0995..80adc3e347 100644
--- a/lib/stdlib/doc/src/re.xml
+++ b/lib/stdlib/doc/src/re.xml
@@ -80,7 +80,11 @@
- a unicode_binary is allowed as the tail of the list</code>
<code type="none">
- mp() = Opaque datatype containing a compiled regular expression.</code>
+ mp() = Opaque datatype containing a compiled regular expression.
+ - The mp() is guaranteed to be a tuple() having the atom
+ 're_pattern' as it's first element, to allow for matching in
+ guards. The arity of the tuple() or the content of the other fields
+ is however not to be trusted.</code>
</section>
<funcs>
<func>