diff --git a/doc/python_api_reference_vDev.md b/doc/python_api_reference_vDev.md
index 1791d4f5c..6508aec4a 100644
--- a/doc/python_api_reference_vDev.md
+++ b/doc/python_api_reference_vDev.md
@@ -1309,7 +1309,7 @@ def detector_error_model(
             error mechanisms). When set to true, the probabilities of the disjoint
             cases are instead assumed to be independent probabilities. For example,
             a `PAULI_CHANNEL_1(0.1, 0.2, 0.0)` becomes equivalent to an
-            `X_ERROR(0.1)` followed by a `Z_ERROR(0.2)`. This assumption is an
+            `X_ERROR(0.1)` followed by a `Y_ERROR(0.2)`. This assumption is an
             approximation, but it is a good approximation for small probabilities.
 
             This argument can also be set to a probability between 0 and 1, setting