updated for version 7.3.900
Problem:    Not obvious that some mouse features are mutual-exclusive.
Solution:   Add a comment.
diff --git a/src/version.c b/src/version.c
index 4a5a0be..9884bf9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -729,6 +729,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    900,
+/**/
     899,
 /**/
     898,