diff --git a/doc/source/firmware/pt1000-processing.rst b/doc/source/firmware/pt1000-processing.rst
index 492d232..cfd9e50 100644
--- a/doc/source/firmware/pt1000-processing.rst
+++ b/doc/source/firmware/pt1000-processing.rst
@@ -132,7 +132,7 @@ and
 .. doxygenfunction:: adc_pt1000_get_resistance_calibration
 	:outline:
 
-are used to set the reistance calibration internally. For a guide on how to calibrate the deivce, see the corresponding :ref:`usage_calibration` usage page.
+are used to set the resistance calibration internally. For a guide on how to calibrate the deivce, see the corresponding :ref:`usage_calibration` usage page.
 
 The calibration is calculated the following way:
 
@@ -147,13 +147,13 @@ The calibration is calculated the following way:
 		OFFSET [label="Offset", description="Offset Correction :math:`O`"];
 		OUT [shape=endpoint, description="Corrected Value"];
 
-		LF -> SENS -> OFFSET -> OUT
+		LF -> OFFSET -> SENS -> OUT
 	}
 
 The final calibrated PT1000 resistance is calculated as:
 
 .. math::
-	R_{PT1000_{corr}} = R_{PT1000_{LF}} \cdot (1 + \sigma) + O
+	R_{PT1000_{corr}} = (R_{PT1000_{LF}} - O) \cdot (1 + \sigma)
 
 The default values, if no calibration is loaded / executed, are: