diff --git a/Index.md b/Index.md
index dc106cb..a438d03 100644
--- a/Index.md
+++ b/Index.md
@@ -1,7 +1,7 @@
 # book6 Main Index
-<img src="./book6logo.png" width="200px" height="auto"/>
+<img src="./book6logo.png" alt="book6 logo" width="200px" height="auto"/>
 
-Generated at 2023-01-01 15:55:29 UTC+1300
+Generated at 2023-01-02 10:48:17 UTC+1300
 
 This index was created automatically, so it's dumb. It is not case-sensitive. It has links to each section that mentions each keyword.
 <!-- Link lines generated automatically; do not delete -->
diff --git a/utilities/indexBook.py b/utilities/indexBook.py
index 9d95c88..be4414f 100644
--- a/utilities/indexBook.py
+++ b/utilities/indexBook.py
@@ -6,11 +6,12 @@
 # Version: 2022-12-26 - original
 # Version: 2022-12-27 - cosmetic improvements
 # Version: 2022-12-28 - allow keywords starting with digit
-# Version: 2022-12-30 - include timestaemp
+# Version: 2022-12-30 - include timestamp
+# Version: 2023-01-02 - added alt text to logo
 
 
 ########################################################
-# Copyright (C) 2022 Brian E. Carpenter.                  
+# Copyright (C) 2022-2023 Brian E. Carpenter.                  
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with
@@ -263,7 +264,7 @@ for i in range(len(index)):
         index[i] = index[i].replace(head, '['+blob)
 
 index.insert(0,'# book6 Main Index\n')
-index.insert(1,'<img src="./book6logo.png" width="200px" height="auto"/>\n\n')
+index.insert(1,'<img src="./book6logo.png" alt="book6 logo" width="200px" height="auto"/>\n\n')
 index.insert(2,"Generated at "+timestamp+"\n\n")
 index.insert(3,"This index was created automatically, so it's dumb. ")
 index.insert(4,"It is not case-sensitive. ")