diff --git a/_constraints b/_constraints
new file mode 100644
index 0000000..d0364c7
--- /dev/null
+++ b/_constraints
@@ -0,0 +1,10 @@
+<constraints>
+    <hardware>
+      <physicalmemory>
+        <size unit="G">10</size>
+      </physicalmemory>
+      <disk>
+        <size unit="G">24</size>
+      </disk>
+    </hardware>
+</constraints>
diff --git a/python-sherpa.changes b/python-sherpa.changes
index 1dbd5f7..c0d24c5 100644
--- a/python-sherpa.changes
+++ b/python-sherpa.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Jan  3 19:45:18 UTC 2024 - Matej Cepl <mcepl@cepl.eu>
+
+- Add _constraints to add memory and disk available for testing.
+
 -------------------------------------------------------------------
 Fri Dec 15 03:54:30 UTC 2023 - Steve Kowalik <steven.kowalik@suse.com>
 
diff --git a/python-sherpa.spec b/python-sherpa.spec
index a6c7f5f..0bcd130 100644
--- a/python-sherpa.spec
+++ b/python-sherpa.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package python-sherpa
 #
-# Copyright (c) 2023 SUSE LLC
+# Copyright (c) 2024 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed