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-rw-r--r--pyhegp/serialization.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/pyhegp/serialization.py b/pyhegp/serialization.py
index db1360a..4a8b7a2 100644
--- a/pyhegp/serialization.py
+++ b/pyhegp/serialization.py
@@ -1,5 +1,5 @@
 ### pyhegp --- Homomorphic encryption of genotypes and phenotypes
-### Copyright © 2025 Arun Isaac <arunisaac@systemreboot.net>
+### Copyright © 2025–2026 Arun Isaac <arunisaac@systemreboot.net>
 ###
 ### This file is part of pyhegp.
 ###
@@ -96,7 +96,7 @@ def read_genotype(file):
     return df
 
 def is_phenotype_metadata_column(name):
-    return name.lower() == "sample-id"
+    return name.lower() in ["sample-id", "intercept"]
 
 def read_phenotype(file):
     df = read_tsv(file, {"sample-id": "str"})