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-rw-r--r--manual/install.texi8
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diff --git a/manual/install.texi b/manual/install.texi
index e8f36d5726..a81139780c 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -633,6 +633,14 @@ As of release time PExpect 4.8.0 is the newest verified to work to test
 the pretty printers.
 
 @item
+The Python @code{abnf} module.
+
+This module is optional and used to verify some ABNF grammars in the
+manual.  Version 2.2.0 has been confirmed to work as expected.  A
+missing @code{abnf} module does not reduce the test coverage of the
+library itself.
+
+@item
 GDB 7.8 or later with support for Python 2.7/3.4 or later
 
 GDB itself needs to be configured with Python support in order to use