diff --git a/schemas/ispyb/updates/2026_01_12_CTF_iceRingDensity.sql b/schemas/ispyb/updates/2026_01_12_CTF_iceRingDensity.sql
new file mode 100644
index 0000000..4073298
--- /dev/null
+++ b/schemas/ispyb/updates/2026_01_12_CTF_iceRingDensity.sql
@@ -0,0 +1,8 @@
+INSERT IGNORE INTO SchemaStatus (scriptName, schemaStatus) VALUES ('2026_01_12_CTF_iceRingDensity.sql', 'ONGOING');
+
+ALTER TABLE CTF
+  ADD iceRingDensity float
+    COMMENT 'Summed intensity of ice ring in fourier space',
+  ALGORITHM=INSTANT;
+
+UPDATE SchemaStatus SET schemaStatus = 'DONE' WHERE scriptName = '2026_01_12_CTF_iceRingDensity.sql';