diff --git a/elftools/elf/descriptions.py b/elftools/elf/descriptions.py
index 8b78fb96..37415aa5 100644
--- a/elftools/elf/descriptions.py
+++ b/elftools/elf/descriptions.py
@@ -680,6 +680,11 @@ def describe_note_gnu_properties(properties, machine):
     (2, 'pac'),
 )
 
+_DESCR_NOTE_GNU_PROPERTY_RISCV_FEATURE_1_AND = (
+    (1, 'ZICFILP'),
+    (2, 'ZICFISS'),
+)
+
 def _reverse_dict(d, low_priority=()):
     """
     This is a tiny helper function to "reverse" the keys/values of a dictionary