diff --git a/Doc/lib/libsyslog.tex b/Doc/lib/libsyslog.tex
index 37d6b6614a1..feb56c1999a 100644
--- a/Doc/lib/libsyslog.tex
+++ b/Doc/lib/libsyslog.tex
@@ -8,6 +8,8 @@ of the \code{syslog} facility.
 
 The module defines the following functions:
 
+\renewcommand{\indexsubitem}{(in module syslog)}
+
 \begin{funcdesc}{syslog}{\optional{priority\,} message}
 Send the string \var{message} to the system logger.
 A trailing newline is added if necessary.
diff --git a/Doc/libsyslog.tex b/Doc/libsyslog.tex
index 37d6b6614a1..feb56c1999a 100644
--- a/Doc/libsyslog.tex
+++ b/Doc/libsyslog.tex
@@ -8,6 +8,8 @@ of the \code{syslog} facility.
 
 The module defines the following functions:
 
+\renewcommand{\indexsubitem}{(in module syslog)}
+
 \begin{funcdesc}{syslog}{\optional{priority\,} message}
 Send the string \var{message} to the system logger.
 A trailing newline is added if necessary.