diff --git a/doc/api/crypto.rst b/doc/api/crypto.rst
index 0568ad7..a10e9e3 100644
--- a/doc/api/crypto.rst
+++ b/doc/api/crypto.rst
@@ -37,13 +37,15 @@
 The following serialization functions take one of these constants to
 determine the format.
 
-:data:`FILETYPE_PEM` serializes data to a Base64-encoded encoded representation
-of the underlying ASN.1 data structure. :data:`FILETYPE_ASN1` serializes data
-to the underlying ASN.1 data structure. The format used by
-:data:`FILETYPE_ASN1` is also sometimes referred to as DER.
-
 .. py:data:: FILETYPE_PEM
-             FILETYPE_ASN1
+
+:data:`FILETYPE_PEM` serializes data to a Base64-encoded encoded representation
+of the underlying ASN.1 data structure.
+
+.. py:data:: FILETYPE_ASN1
+
+:data:`FILETYPE_ASN1` serializes data to the underlying ASN.1 data structure.
+The format used by :data:`FILETYPE_ASN1` is also sometimes referred to as DER.
 
 Certificates
 ~~~~~~~~~~~~