diff --git a/src/java/com/wolfssl/WolfSSL.java b/src/java/com/wolfssl/WolfSSL.java
index 993f6d6..52e0fe9 100644
--- a/src/java/com/wolfssl/WolfSSL.java
+++ b/src/java/com/wolfssl/WolfSSL.java
@@ -187,9 +187,13 @@ public class WolfSSL {
     public final static int WOLFSSL_OCSP_NO_NONCE     = 2;
 
     /* ALPN definitions from ssl.h */
+    /** ALPN: no match found */
     public final static int WOLFSSL_ALPN_NO_MATCH = 0;
+    /** ALPN: found match */
     public final static int WOLFSSL_ALPN_MATCH    = 1;
+    /** ALPN: continue on protocol mismatch */
     public final static int WOLFSSL_ALPN_CONTINUE_ON_MISMATCH = 2;
+    /** ALPN: failed on protocol mismatch */
     public final static int WOLFSSL_ALPN_FAILED_ON_MISMATCH   = 4;
 
     /* I/O callback default errors, pulled from wolfssl/ssl.h IOerrors */
diff --git a/src/java/com/wolfssl/provider/jsse/WolfSSLEngineHelper.java b/src/java/com/wolfssl/provider/jsse/WolfSSLEngineHelper.java
index cc9e4df..3f10bbd 100644
--- a/src/java/com/wolfssl/provider/jsse/WolfSSLEngineHelper.java
+++ b/src/java/com/wolfssl/provider/jsse/WolfSSLEngineHelper.java
@@ -370,6 +370,12 @@ public class WolfSSLEngineHelper {
         return null;
     }
 
+    /**
+     * Get selected ALPN protocol string
+     *
+     * @return String representation of selected ALPN protocol or null
+     *         if handshake has not finished
+     */
     protected String getAlpnSelectedProtocolString() {
         if (ssl.handshakeDone()) {
             String proto = ssl.getAlpnSelectedString();
diff --git a/src/java/com/wolfssl/provider/jsse/adapter/WolfSSLJDK8Helper.java b/src/java/com/wolfssl/provider/jsse/adapter/WolfSSLJDK8Helper.java
index 4a37f2d..24379c0 100644
--- a/src/java/com/wolfssl/provider/jsse/adapter/WolfSSLJDK8Helper.java
+++ b/src/java/com/wolfssl/provider/jsse/adapter/WolfSSLJDK8Helper.java
@@ -110,8 +110,14 @@ public class WolfSSLJDK8Helper
         }
     }
 
-    /* Call SSLParameters.setApplicationProtocols() to set ALPN protocols from
-     * WolfSSLParameters into SSLParameters */
+    /**
+     * Call SSLParameters.setApplicationProtocols() to set ALPN protocols from
+     * WolfSSLParameters into SSLParameters.
+     *
+     * @param out output SSLParameters to store ALPN protocols into
+     * @param m method to invoke to set protocols
+     * @param in input WolfSSLParameters to read ALPN protocols from
+     */
     protected static void setApplicationProtocols(final SSLParameters out,
                                          final Method m, WolfSSLParameters in) {
 
@@ -137,8 +143,13 @@ public class WolfSSLJDK8Helper
         }
     }
 
-    /* Call SSLParameters.getApplicationProtocols() to get ALPN protocols from
-     * SSLParameters into WolfSSLParameters */
+    /**
+     * Call SSLParameters.getApplicationProtocols() to get ALPN protocols from
+     * SSLParameters into WolfSSLParameters.
+     *
+     * @param in input SSLParameters to read ALPN protocols from
+     * @param out output WolfSSLParameters to store ALPN protocols into
+     */
     protected static void getApplicationProtocols(final SSLParameters in,
                                          WolfSSLParameters out) {