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-rw-r--r--lib/stdlib/doc/src/string.xml8
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/stdlib/doc/src/string.xml b/lib/stdlib/doc/src/string.xml
index 343904a49a..9d5edd9ecf 100644
--- a/lib/stdlib/doc/src/string.xml
+++ b/lib/stdlib/doc/src/string.xml
@@ -311,7 +311,9 @@ true</pre>
<desc>
<p>
Returns the first codepoint in <c><anno>String</anno></c>
- and the rest of <c><anno>String</anno></c> in the tail.
+ and the rest of <c><anno>String</anno></c> in the tail. Returns
+ an empty list if <c><anno>String</anno></c> is empty or an
+ <c>{error, String}</c> tuple if the next byte is invalid.
</p>
<p><em>Example:</em></p>
<pre>
@@ -326,7 +328,9 @@ true</pre>
<desc>
<p>
Returns the first grapheme cluster in <c><anno>String</anno></c>
- and the rest of <c><anno>String</anno></c> in the tail.
+ and the rest of <c><anno>String</anno></c> in the tail. Returns
+ an empty list if <c><anno>String</anno></c> is empty or an
+ <c>{error, String}</c> tuple if the next byte is invalid.
</p>
<p><em>Example:</em></p>
<pre>