diff --git a/doc/apple2.sgml b/doc/apple2.sgml
index 1a6d23b6a..0f816a3ec 100644
--- a/doc/apple2.sgml
+++ b/doc/apple2.sgml
@@ -294,6 +294,7 @@ usage.
 <item>_dos_type
 <item>get_ostype
 <item>rebootafterexit
+<item>tgi_apple2_mix
 </itemize>
 
 
diff --git a/doc/apple2enh.sgml b/doc/apple2enh.sgml
index 527159b97..e257861c3 100644
--- a/doc/apple2enh.sgml
+++ b/doc/apple2enh.sgml
@@ -296,6 +296,7 @@ usage.
 <item>rebootafterexit
 <item>textframe
 <item>textframexy
+<item>tgi_apple2_mix
 <item>videomode
 </itemize>
 
@@ -321,7 +322,10 @@ you cannot do it, it just means that there's no help.
   This driver features a resolution of 280&times;192 with 8 colors and two
   hires pages. Note that programs using this driver will have to be linked
   with <tt/--start-addr $4000/ to reserve the first hires page or with
-  <tt/--start-addr $6000/ to reserve both hires pages.
+  <tt/--start-addr $6000/ to reserve both hires pages. Note that the second
+  hires page is only available if the text display is not in 80 column mode.
+  This can be asserted by calling <tt/videomode (VIDEOMODE_40COL);/ before
+  installing the driver.
   
   In memory constrained situations the memory from &dollar;803 to &dollar;1FFF
   can be made available to a program by calling <tt/_heapadd ((void *) 0x0803, 0x17FD);/