diff --git a/doc/configuration.txt b/doc/configuration.txt
index 7b8519a..a25bab3 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -1067,6 +1067,7 @@
    - tune.bufsize
    - tune.chksize
    - tune.comp.maxlevel
+   - tune.fail-alloc
    - tune.fd.edge-triggered
    - tune.h2.header-table-size
    - tune.h2.initial-window-size