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-rw-r--r--org-fc-core.el4
1 files changed, 3 insertions, 1 deletions
diff --git a/org-fc-core.el b/org-fc-core.el
index 1033cf1..1ed2508 100644
--- a/org-fc-core.el
+++ b/org-fc-core.el
@@ -125,7 +125,9 @@ types."
(defcustom org-fc-algorithm 'sm2-v1
"Algorithm for spacing reviews of cards."
- :type '(choice (const sm2-v1) (const sm2-v2))
+ :type '(choice (const sm2-v1)
+ (const sm2-v2)
+ (const tn))
:group 'org-fc)
(defcustom org-fc-bury-siblings nil