diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 861359b3ff7..379a29c0671 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2374,9 +2374,7 @@ const char *PQsslAttribute(const PGconn *conn, const char *attribute_name);
          <term><literal>compression</literal></term>
           <listitem>
            <para>
-            If SSL compression is in use, returns the name of the compression
-            algorithm, or "on" if compression is used but the algorithm is
-            not known. If compression is not in use, returns "off".
+            Returns "on" if SSL compression is in use, else it returns "off".
            </para>
           </listitem>
          </varlistentry>