diff --git a/pulser-core/pulser/pulse.py b/pulser-core/pulser/pulse.py
index bb258f7e3..46b68757e 100644
--- a/pulser-core/pulser/pulse.py
+++ b/pulser-core/pulser/pulse.py
@@ -115,8 +115,8 @@ def __init__(
             )
         if np.any(amplitude.samples.as_array(detach=True) < 0):
             raise ValueError(
-                "All samples of an amplitude waveform must be "
-                "greater than or equal to zero."
+                "All samples of an amplitude waveform must be >= 0; "
+                f"found negative values in amplitude waveform: {amplitude}."
             )
         object.__setattr__(self, "amplitude", amplitude)
         object.__setattr__(self, "detuning", detuning)