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-rw-r--r--qolab/feedback/__init__.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/qolab/feedback/__init__.py b/qolab/feedback/__init__.py
index 6f375ee..7d1ef74 100644
--- a/qolab/feedback/__init__.py
+++ b/qolab/feedback/__init__.py
@@ -4,6 +4,7 @@ from qolab.hardware.basic import BasicInstrument
class PID(BasicInstrument):
"""Proportional–integral–derivative controller.
+
Calculates feedback based on gains, time, and previous error signal measurements.
"""