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-rw-r--r--src/lib/ecl/attitude_fw/ecl_pitch_controller.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/lib/ecl/attitude_fw/ecl_pitch_controller.h b/src/lib/ecl/attitude_fw/ecl_pitch_controller.h
index 3221bd484..1e6cec6a1 100644
--- a/src/lib/ecl/attitude_fw/ecl_pitch_controller.h
+++ b/src/lib/ecl/attitude_fw/ecl_pitch_controller.h
@@ -40,7 +40,9 @@
* Acknowledgements:
*
* The control design is based on a design
- * by Paul Riseborough and Andrew Tridgell, 2013.
+ * by Paul Riseborough and Andrew Tridgell, 2013,
+ * which in turn is based on initial work of
+ * Jonathan Challinger, 2012.
*/
#ifndef ECL_PITCH_CONTROLLER_H