diff --git a/exthttpcheck/check.go b/exthttpcheck/check.go
index 0baf43f..487930e 100644
--- a/exthttpcheck/check.go
+++ b/exthttpcheck/check.go
@@ -250,6 +250,9 @@ func requestWorker(executionRunData *ExecutionRunData, state *HTTPCheckState, ch
 							responseConstraintFulfilled := strings.Contains(bodyString, state.ResponsesContains)
 							metricMap["response_constraints_fulfilled"] = strconv.FormatBool(responseConstraintFulfilled)
 							responseBodyWasSuccessful = responseConstraintFulfilled
+							if !(responseConstraintFulfilled) {
+								log.Trace().Str("response_body", bodyString).Str("expected_string", state.ResponsesContains).Msg("response body does not contain expected string")
+							}
 						}
 					}
 				}