diff --git a/TrimSP.html b/TrimSP.html
index 35665ee..8a343af 100644
--- a/TrimSP.html
+++ b/TrimSP.html
@@ -319,10 +319,10 @@
Table 1 in Anderson & Ziegler (1977).
Table 3.1 in ICRU Report 49 (1993).
Table II in McFadden et al. (2023) and McFadden et al. (unpublished).
+
Note: While option 3 contains the most up-to-date values, it currently
does not contain entries for every target element. For elements with
missing data, values from option 2 are taken instead.
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