improved comment

Author: NimaSarajpoor

stumpy/sdp.py

@@ -282,8 +282,9 @@ def __call__(self, Q, T, n_threads=1, planning_flag="FFTW_ESTIMATE"):
             rfft_obj.update_arrays(real_arr, complex_arr)
             irfft_obj.update_arrays(complex_arr, real_arr)
 
-        # Compute the (circular) convolution between T and Q[::-1]
-        # using FFT, and then take the relevant slice of the output
+        # Compute the (circular) convolution between T and Q[::-1], 
+        # each zero-padded to length `next_fast_n` by performing
+        # the following three steps:
 
         # Step 1
         # Compute RFFT of T (zero-padded)