diff --git a/signalgen.py b/signalgen.py
index 4781dfa..dfe051d 100755
--- a/signalgen.py
+++ b/signalgen.py
@@ -11,6 +11,7 @@ from jess.dispersion import dedisperse
 from jess.fitters import median_fitter
 from scipy.stats import median_abs_deviation
 from your import Your, Writer
+from your.formats.filwriter import make_sigproc_object
 from will import create, inject
 
 
@@ -79,7 +80,7 @@ def addBurst(values):
 	basename = path.basename(values.file)
 	samples = 8096
 	
-	#the full filterbanks use 64GB in RAM, so we write out a truncated version and load that instead.
+	#the full filterbanks use 64GB in RAM when injecting burst, so we write out a truncated version and load that instead.
 	filWriter = Writer(filterbankObj, outdir="./", outname = f"{basename}_trunc", nstart = 0, nsamp = samples)
 	filWriter.to_fil()
 	#replace filterbankObj object and reload spectra (spectra should be the same but just in case)
@@ -121,11 +122,15 @@ def addBurst(values):
 	)
 
 	logger.info("Saving plot and filterbank.")
-	#and save the new plot and filterbank file
+	#and save the new plot
 	show_dynamic(injectedSpectra, f"{basename} Dynamic Spectra and {values.dm} DM Pulse", save=True)
-	filWriter = Writer(filterbankObj, outdir="./", outname = f"{basename}_injected", nstart = 0, nsamp = samples)
-	filWriter.to_fil(data=injectedSpectra)
-	logger.info(f"{basename}_injected.fil successfully written.")
+	#now generate new filterbank file
+
+	sigprocObj = make_sigproc_object(**(filterbankObj.your_header))
+	newName = f"{basename}_injected.fil"
+	sigprocObj.write_header(newName)
+	sigprocObj.append_spectra(injectedSpectra, newName)
+	logger.info(f"{newName} successfully written.")