diff --git a/aslprep/workflows/asl/ge_utils.py b/aslprep/workflows/asl/ge_utils.py
index 6e4429466..1b05f0262 100644
--- a/aslprep/workflows/asl/ge_utils.py
+++ b/aslprep/workflows/asl/ge_utils.py
@@ -63,14 +63,14 @@ def init_asl_reference_ge_wf(
     elif m0type == "Estimate":
         ref_str = (
             f"The reference volume was generated from {processing_target} volumes, which were "
-            f"averaged and smoothed with a Gaussian kernel ({smooth_kernel} mm). "
+            f"averaged and smoothed with a Gaussian kernel (FWHM={smooth_kernel} mm). "
             f"A single M0 estimate of {metadata['M0Estimate']} was used to produce a calibration "
             "'image'."
         )
     else:
         ref_str = (
             f"The reference volume was generated from {processing_target} volumes, which were "
-            f"averaged and smoothed with a Gaussian kernel ({smooth_kernel} mm). "
+            f"averaged and smoothed with a Gaussian kernel (FWHM={smooth_kernel} mm). "
             f"As no calibration images or provided M0 estimate was available for the ASL scan, "
             "the reference volume was retained for later use in CBF calculation."
         )