diff --git a/impl/src/layer1/freq_est.c b/impl/src/layer1/freq_est.c
index 0bc402d..c6732e1 100644
--- a/impl/src/layer1/freq_est.c
+++ b/impl/src/layer1/freq_est.c
@@ -143,7 +143,7 @@ float freq_est_in_rampup(const float complex *recv, size_t n, float *final_phase
 
 	// rotate every second symbol by 180°. As a plausibility check that we are
 	// in fact inside the ramp-up, we verify that there is no phase rotation by
-	// more than 90° between the symbols.
+	// more than 60° between the symbols.
 	for(size_t i = 0; i < n; i++) {
 		if((i % 2) == 0) {
 			rotated[i] = recv[i];
@@ -154,7 +154,7 @@ float freq_est_in_rampup(const float complex *recv, size_t n, float *final_phase
 		float phase = cargf(rotated[i]);
 		if(i > 0) {
 			float phase_delta = phase - prev_phase;
-			if(fabsf(phase_delta) > 3.14159f/2.0f) {
+			if(fabsf(phase_delta) > 3.14159f/3.0f) {
 				// abort because we either have the wrong signal or too much noise.
 				if(final_phase) {
 					*final_phase = 0.0f;