diff --git a/src/cal_tools/exceptions.py b/src/cal_tools/exceptions.py
new file mode 100644
index 0000000000000000000000000000000000000000..5dbcbca65f8d7a81a4193df6821ca041d2df53ac
--- /dev/null
+++ b/src/cal_tools/exceptions.py
@@ -0,0 +1,2 @@
+class CalibrationError(Exception):
+    pass
diff --git a/src/cal_tools/warnings.py b/src/cal_tools/warnings.py
index 10b1c2df833bea8441b1134b2147f12335ff18ec..d54686ba0fe5fc61e33d14df1b81b4bd4bb52668 100644
--- a/src/cal_tools/warnings.py
+++ b/src/cal_tools/warnings.py
@@ -1,2 +1,2 @@
-class CalWarning(UserWarning):
-    pass
\ No newline at end of file
+class CalibrationWarning(UserWarning):
+    pass