diff --git a/docs/global_substitutions.txt b/docs/global_substitutions.txt
index af1514675..0cf294665 100644
--- a/docs/global_substitutions.txt
+++ b/docs/global_substitutions.txt
@@ -16,7 +16,7 @@
 .. |EHF| replace:: :term:`EHF`
 .. |FCONF| replace:: :term:`FCONF`
 .. |FDT| replace:: :term:`FDT`
-.. |FFA| replace:: :term:`FFA`
+.. |FF-A| replace:: :term:`FF-A`
 .. |FIP| replace:: :term:`FIP`
 .. |FVP| replace:: :term:`FVP`
 .. |FWU| replace:: :term:`FWU`