diff --git a/man8/ld.so.8 b/man8/ld.so.8
index 5a0226ddf..ce63c4c46 100644
--- a/man8/ld.so.8
+++ b/man8/ld.so.8
@@ -240,15 +240,23 @@ is ignored for set-user-ID/set-group-ID binaries.
 .TP
 .B LD_PROFILE
 (glibc since 2.1)
-Shared object to be profiled.
+Shared object to be profiled,
+specified either as a pathname or a soname.
+Profiling output is written to the file whose name is:
+"\fI$LD_PROFILE_OUTPUT\fP/\fI$LD_PROFILE\fP.profile".
 .TP
 .B LD_PROFILE_OUTPUT
 (glibc since 2.1)
-File where
+Directory where
 .B LD_PROFILE
-output should be written; default is standard output.
+output should be written.
+If this variable is not defined, or is defined as an empty string,
+then the default is
+.IR /var/tmp .
 .B LD_PROFILE_OUTPUT
-is ignored for set-user-ID/set-group-ID binaries.
+is ignored for set-user-ID and set-group-ID programs,
+which always use
+.IR /var/profile .
 .TP
 .B LD_SHOW_AUXV
 (glibc since 2.1)