diff --git a/src/config.in b/src/config.in
index 6886fd79ad0..ea4702ea279 100644
--- a/src/config.in
+++ b/src/config.in
@@ -154,18 +154,26 @@ and this notice must be preserved on all copies.  */
 #endif
 #endif
 
-/* Define LD_SWITCH_SITE to contain any special flags your loader may
-   need.  For instance, if you've defined HAVE_X_WINDOWS above and your
-   X libraries aren't in a place that your loader can find on its own,
-   you might want to add "-L/..." or something similar.  */
+/* Define LD_SWITCH_SITE to contain any special flags your loader may need.  */
 /* #define LD_SWITCH_SITE */
 
-/* Define C_SWITCH_SITE to contain any special flags your compiler may
-   need.  For instance, if you've defined HAVE_X_WINDOWS above and your
-   X include files aren't in a place that your compiler can find on its
-   own, you might want to add "-I/..." or something similar.  */
+/* Define C_SWITCH_SITE to contain any special flags your compiler needs.  */
 /* #define C_SWITCH_SITE */
 
+/* Define LD_SWITCH_X_SITE to contain any special flags your loader
+   may need to deal with X Windows.  For instance, if you've defined
+   HAVE_X_WINDOWS above and your X libraries aren't in a place that
+   your loader can find on its own, you might want to add "-L/..." or
+   something similar.  */
+/* #define LD_SWITCH_X_SITE */
+
+/* Define C_SWITCH_X_SITE to contain any special flags your compiler
+   may need to deal with X Windows.  For instance, if you've defined
+   HAVE_X_WINDOWS above and your X include files aren't in a place
+   that your compiler can find on its own, you might want to add
+   "-I/..." or something similar.  */
+/* #define C_SWITCH_X_SITE */
+
 /* Define the return type of signal handlers if the s-xxx file
    did not already do so.  */
 #ifndef SIGTYPE