diff --git a/docs/imexam/example1.rst b/docs/imexam/example1.rst
index 4f0d4b66..80808348 100644
--- a/docs/imexam/example1.rst
+++ b/docs/imexam/example1.rst
@@ -15,7 +15,7 @@ First you need to import the package
     import imexam
 
 
-Usage with D9 (the current default viewer)
+Usage with DS9 (the current default viewer)
 ------------------------------------------
 If you are on a windows system, and DS9 is not be available, move on to the Ginga specification.
 
diff --git a/docs/imexam/walkthrough.rst b/docs/imexam/walkthrough.rst
index 9e2cdd65..43811e3d 100644
--- a/docs/imexam/walkthrough.rst
+++ b/docs/imexam/walkthrough.rst
@@ -12,7 +12,7 @@ First you need to import the package
     import imexam
 
 
-Usage with D9 (the current default viewer)
+Usage with DS9 (the current default viewer)
 ------------------------------------------
 Start up a ``DS9`` window (DS9 is the default viewer):