diff --git a/configs/ez80f910200kitg/README.txt b/configs/ez80f910200kitg/README.txt
index d40ac43037..f72c8e8fd2 100644
--- a/configs/ez80f910200kitg/README.txt
+++ b/configs/ez80f910200kitg/README.txt
@@ -53,11 +53,18 @@ Version 5.1.1
   on a different platform, you will need to change the path in the ZDS binaries
   in those same files.
 
+Version 5.2.1
+
+  On January 31, 2016, I tried ZDS-II version 5.2.1.  I believe that I have
+  all of the changes in place to support that version.  At compile time,
+  however, I encountered compiler internal errors.  I did not pursue that
+  build any further.
+
 Other Versions
-  If you use any version of ZDS-II other than 5.1.1 or if you install ZDS-II
-  at any location other than the default location, you will have to modify
-  two files:  (1) configs/ez80f910200kitg/*/setenv.sh and (2)
-  configs/ez80f910200kitg/*/Make.defs.
+  If you use any version of ZDS-II other than 5.1.1 or 5.2.1 or if you install
+  ZDS-II at any location other than the default location, you will have to
+  modify one or more of three files:  (1) configs/ez80f910200kitg/*/setenv.sh,
+  (2) configs/ez80f910200kitg/*/Make.defs, and arch/z80/src/ez80/Toolchain.defs.
 
 Configuration Subdirectories
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/configs/ez80f910200zco/README.txt b/configs/ez80f910200zco/README.txt
index ef71dc4ec1..cf53682bcf 100644
--- a/configs/ez80f910200zco/README.txt
+++ b/configs/ez80f910200zco/README.txt
@@ -53,11 +53,18 @@ Version 5.1.1
   on a different platform, you will need to change the path in the ZDS binaries
   in those same files.
 
+Version 5.2.1
+
+  On January 31, 2016, I tried ZDS-II version 5.2.1.  I believe that I have
+  all of the changes in place to support that version.  At compile time,
+  however, I encountered compiler internal errors.  I did not pursue that
+  build any further.
+
 Other Versions
-  If you use any version of ZDS-II other than 5.1.1 or if you install ZDS-II
-  at any location other than the default location, you will have to modify
-  two files:  (1) configs/ez80f910200kitg/*/setenv.sh and (2)
-  configs/ez80f910200kitg/*/Make.defs.
+  If you use any version of ZDS-II other than 5.1.1 or 5.2.1 or if you install
+  ZDS-II at any location other than the default location, you will have to
+  modify one or more of three files:  (1) configs/ez80f910200zco/*/setenv.sh,
+  (2) configs/ez80f910200zco/*/Make.defs, and arch/z80/src/ez80/Toolchain.defs.
 
 Configurations
 ^^^^^^^^^^^^^^