docs: Add note about updating tests to dev info

Signed-off-by: Timothy Arceri <t_arceri@yahoo.com.au>
diff --git a/docs/devinfo.html b/docs/devinfo.html
index d4a6dfb..67c1f34 100644
--- a/docs/devinfo.html
+++ b/docs/devinfo.html
@@ -56,6 +56,11 @@
    If the new extension adds new GL state, the functions in get.c, enable.c
    and attrib.c will most likely require new code.
 </li>
+<li>
+   The dispatch tests check_table.cpp and dispatch_sanity.cpp
+   should be updated with details about the new extensions functions. These
+   tests are run using 'make check'
+</li>
 </ul>