#10130: Prepare for building epub-format docs.
diff --git a/Doc/README.txt b/Doc/README.txt
index 03b1c7f..e386e87 100644
--- a/Doc/README.txt
+++ b/Doc/README.txt
@@ -54,6 +54,9 @@
* "text", which builds a plain text file for each source file.
+ * "epub", which builds an EPUB document, suitable to be viewed on e-book
+ readers.
+
* "linkcheck", which checks all external references to see whether they are
broken, redirected or malformed, and outputs this information to stdout as
well as a plain-text (.txt) file.