diff --git a/pgp-cert-d-java-jdbc-sqlite-lookup/README.md b/pgp-cert-d-java-jdbc-sqlite-lookup/README.md
new file mode 100644
index 0000000..79a9113
--- /dev/null
+++ b/pgp-cert-d-java-jdbc-sqlite-lookup/README.md
@@ -0,0 +1,12 @@
+<!--
+SPDX-FileCopyrightText: 2022 Paul Schaub <info@pgpainless.org>
+
+SPDX-License-Identifier: Apache-2.0
+-->
+
+# SQLite backed Subkey-ID Lookup
+
+[![javadoc](https://javadoc.io/badge2/org.pgpainless/pgp-cert-d-java-jdbc-sqlite-lookup/javadoc.svg)](https://javadoc.io/doc/org.pgpainless/pgp-cert-d-java-jdbc-sqlite-lookup)
+[![Maven Central](https://badgen.net/maven/v/maven-central/org.pgpainless/pgp-cert-d-java-jdbc-sqlite-lookup)](https://search.maven.org/artifact/org.pgpainless/pgp-cert-d-java-jdbc-sqlite-lookup)
+
+Implementation of `pgp-certificate-store`'s `SubkeyLookup` class using an SQLite database accessed through `sqlite-jdbc`.
\ No newline at end of file
diff --git a/pgp-cert-d-java/README.md b/pgp-cert-d-java/README.md
index cb28958..58e29d7 100644
--- a/pgp-cert-d-java/README.md
+++ b/pgp-cert-d-java/README.md
@@ -6,6 +6,9 @@ SPDX-License-Identifier: Apache-2.0
 
 # Shared PGP Certificate Directory for Java
 
+[![javadoc](https://javadoc.io/badge2/org.pgpainless/pgp-cert-d-java/javadoc.svg)](https://javadoc.io/doc/org.pgpainless/pgp-cert-d-java)
+[![Maven Central](https://badgen.net/maven/v/maven-central/org.pgpainless/pgp-cert-d-java)](https://search.maven.org/artifact/org.pgpainless/pgp-cert-d-java)
+
 Backend-agnostic implementation of the [Shared PGP Certificate Directory Specification](https://sequoia-pgp.gitlab.io/pgp-cert-d/).
 This module implements the non-OpenPGP parts of the spec, e.g. locating the directory, resolving certificate file paths,
 locking the directory for writes etc.
@@ -13,4 +16,6 @@ locking the directory for writes etc.
 To get a useful implementation, a backend implementation such as `pgpainless-cert-d` is required, which needs to provide
 support for reading and merging certificates.
 
-`pgp-cert-d-java` can be used as an implementation of `pgp-certificate-store`.
\ No newline at end of file
+`pgp-cert-d-java` can be used as an implementation of `pgp-certificate-store`.
+
+Note: This is a library module. For a command line interface, see [pgpainless-cert-d-cli](https://github.com/pgpainless/cert-d-pgpainless/tree/main/pgpainless-cert-d-cli).
\ No newline at end of file
diff --git a/pgp-certificate-store/README.md b/pgp-certificate-store/README.md
index f6a0eba..58f9af9 100644
--- a/pgp-certificate-store/README.md
+++ b/pgp-certificate-store/README.md
@@ -6,5 +6,8 @@ SPDX-License-Identifier: Apache-2.0
 
 # PGP Certificate Store Definitions
 
+[![javadoc](https://javadoc.io/badge2/org.pgpainless/pgp-certificate-store/javadoc.svg)](https://javadoc.io/doc/org.pgpainless/pgp-certificate-store)
+[![Maven Central](https://badgen.net/maven/v/maven-central/org.pgpainless/pgp-certificate-store)](https://search.maven.org/artifact/org.pgpainless/pgp-certificate-store)
+
 This module contains API definitions for an OpenPGP certificate store.
 A certificate store is used to store public key certificates only.