From a13bc14927b78c2eefe9ddaaa36a1df08fd123b1 Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Wed, 8 Jun 2022 17:52:21 +0530
Subject: topics: genotype-database: Document reading columns.

* topics/genotype-database.gmi: Document reading columns in Python.
---
 topics/genotype-database.gmi | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/topics/genotype-database.gmi b/topics/genotype-database.gmi
index c3f7691..13c321e 100644
--- a/topics/genotype-database.gmi
+++ b/topics/genotype-database.gmi
@@ -9,11 +9,12 @@ To convert a plain text GeneNetwork genotype file `BXD.geno` to a genodb genotyp
 ```
 => https://git.genenetwork.org/GeneNetwork/cl-gn cl-gn
 
-genenetwork3 includes a tiny Python library to read the built genodb database. Here is a sample invocation reading row 17 from a database at `/tmp/bxd`.
+genenetwork3 includes a tiny Python library to read the built genodb database. Here is a sample invocation reading row 17 and column 13 from a database at `/tmp/bxd`.
 ```
 from gn3 import genodb
 
 with genodb.GenotypeDatabase('/tmp/bxd') as db:
     matrix = db.matrix()
     print(matrix.row(17))
+    print(matrix.column(13))
 ```
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