diff --git a/appendices/ini.xml b/appendices/ini.xml
index 5bdada0e6b..b1a877094f 100644
--- a/appendices/ini.xml
+++ b/appendices/ini.xml
@@ -2519,9 +2519,11 @@
       </row>
       <row>
        <entry>serialize_precision</entry>
-       <entry>"100"</entry>
+       <entry>"17"</entry>
        <entry>PHP_INI_ALL</entry>
-       <entry>Available since PHP 4.3.2.</entry>
+       <entry>
+        Available since PHP 4.3.2. Until PHP 5.3.5, the default value was 100.
+       </entry>
       </row>
       <row>
        <entry><link linkend="ini.session.auto-start">session.auto_start</link></entry>