diff --git a/src/pyabf/abf1/headerV1.py b/src/pyabf/abf1/headerV1.py
index dfd32f8..cd13fd2 100644
--- a/src/pyabf/abf1/headerV1.py
+++ b/src/pyabf/abf1/headerV1.py
@@ -81,6 +81,8 @@ def __init__(self, fb):
         self.fInstrumentOffset = self.readStruct("16f", 986)
         self.fSignalGain = self.readStruct("16f", 1050)
         self.fSignalOffset = self.readStruct("16f", 1114)
+        self.fSignalLowpassFilter = self.readStruct("16f", 1178)
+        self.fSignalHighpassFilter = self.readStruct("16f", 1242)
         self.sDACChannelName = self.readStruct("10s"*4, 1306)
         self.sDACChannelUnit = self.readStruct("8s"*4, 1346)
         # missing entries