diff --git a/docs/parsers/x509_cert.md b/docs/parsers/x509_cert.md
index 846b40b9..08512ab5 100644
--- a/docs/parsers/x509_cert.md
+++ b/docs/parsers/x509_cert.md
@@ -379,7 +379,7 @@ Main text parsing function
 
 Parameters:
 
-    data:        (string)  text data to parse
+    data:        (string or bytes) text or binary data to parse
     raw:         (boolean) unprocessed output if True
     quiet:       (boolean) suppress warning messages if True
 
diff --git a/jc/parsers/x509_cert.py b/jc/parsers/x509_cert.py
index e0282274..399f332a 100644
--- a/jc/parsers/x509_cert.py
+++ b/jc/parsers/x509_cert.py
@@ -483,7 +483,7 @@ def parse(
 
     Parameters:
 
-        data:        (string)  text data to parse
+        data:        (string or bytes) text or binary data to parse
         raw:         (boolean) unprocessed output if True
         quiet:       (boolean) suppress warning messages if True