diff --git a/doxygen/dox/high_level/extension.dox b/doxygen/dox/high_level/extension.dox
index 1887c4e50c8..278643365db 100644
--- a/doxygen/dox/high_level/extension.dox
+++ b/doxygen/dox/high_level/extension.dox
@@ -7,14 +7,14 @@
  * for working with region references, hyperslab selections, and bit-fields.
  * These functions were created as part of a project supporting
  * NPP/NPOESS Data Production and Exploitation (
- * <a href="https://\PRJURL/jpss/documentation">project</a>,
+ * <a href="https://\PRJURL/jpss/documentation/index.html">project</a>,
  * <a href="https://\PRJURL/npoess/HL_JPSS">software</a>).
  * While they were written to facilitate access to NPP, NPOESS, and JPSS
  * data in the HDF5 format, these functions may be useful to anyone working
  * with region references, hyperslab selections, or bit-fields.
  *
  * Note that these functions are not part of the standard HDF5 distribution; 
- * the <a href="https://\PRJURL/npoess/HL_JPSS">software</a>
+ * the <a href="https://\PRJURL/npoess/HL_JPSS/index.html">software</a>
  * must be separately downloaded and installed.
  *
  * A comprehensive guide to this library,