diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 692d8a2a17..a9131b3e46 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -10685,6 +10685,12 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
         be used to debug specific areas of the source code.
        </para>
 
+       <para>
+        Note that the maximum number of backtrace frames logged is 100.
+        If the backtrace is larger than 100, the backtrace frames corresponding
+        to the 100 most recent function calls are logged.
+       </para>
+
        <para>
         Backtrace support is not available on all platforms, and the quality
         of the backtraces depends on compilation options.