diff --git a/biometrics/fingerprint/2.1/IBiometricsFingerprint.hal b/biometrics/fingerprint/2.1/IBiometricsFingerprint.hal
index 0b92848..14f3005 100644
--- a/biometrics/fingerprint/2.1/IBiometricsFingerprint.hal
+++ b/biometrics/fingerprint/2.1/IBiometricsFingerprint.hal
@@ -19,7 +19,7 @@
 import IBiometricsFingerprintClientCallback;
 
 interface IBiometricsFingerprint {
-  /*
+  /**
    * Set notification callback:
    * Registers a user function that must receive notifications from the HAL
    * This call must block if the HAL state machine is in busy state until HAL
@@ -32,7 +32,7 @@
   setNotify(IBiometricsFingerprintClientCallback clientCallback)
       generates (uint64_t deviceId);
 
-  /*
+  /**
    * Fingerprint pre-enroll enroll request:
    * Generates a unique token to upper layers to indicate the start of
    * an enrollment transaction. pre-enroll and post-enroll specify
@@ -47,7 +47,7 @@
   @callflow(next={"enroll", "postEnroll"})
   preEnroll() generates (uint64_t authChallenge);
 
-  /*
+  /**
    * Fingerprint enroll request:
    * Switches the HAL state machine to collect and store a new fingerprint
    * template. Switches back as soon as enroll is complete, signalled by
@@ -69,7 +69,7 @@
   enroll(uint8_t[69] hat, uint32_t gid, uint32_t timeoutSec)
       generates (RequestStatus debugErrno);
 
-  /*
+  /**
    * Finishes the enroll operation and invalidates the preEnroll() generated
    * challenge. This must be called at the end of a multi-finger enrollment
    * session to indicate that no more fingers may be added.
@@ -79,7 +79,7 @@
   @callflow(next={"authenticate", "setActiveGroup", "enumerate", "remove"})
   postEnroll() generates (RequestStatus debugErrno);
 
-  /*
+  /**
    * getAuthenticatorId:
    * Returns a token associated with the current fingerprint set. This value
    * must change whenever a new fingerprint is enrolled, thus creating a new
@@ -91,7 +91,7 @@
   @callflow(next={"authenticate"})
   getAuthenticatorId() generates (uint64_t AuthenticatorId);
 
-  /*
+  /**
    * Cancel pending enroll or authenticate, sending FINGERPRINT_ERROR_CANCELED
    * to all running clients. Switches the HAL state machine back to the idle
    * state. Unlike enrollDone() doesn't invalidate the preEnroll() challenge.
@@ -102,7 +102,7 @@
     "setActiveGroup"})
   cancel() generates (RequestStatus debugErrno);
 
-  /*
+  /**
    * Enumerate all the fingerprint templates found in the directory set by
    * setActiveGroup():
    * For each template found a notify() must be called with:
@@ -116,7 +116,7 @@
   @callflow(next={"remove", "enroll", "authenticate", "setActiveGroup"})
   enumerate() generates (RequestStatus debugErrno);
 
-  /*
+  /**
    * Fingerprint remove request:
    * Deletes fingerprint template(s).
    * Works only within the path set by setActiveGroup().
@@ -136,7 +136,7 @@
     "setActiveGroup"})
   remove(uint32_t gid, uint32_t fid) generates (RequestStatus debugErrno);
 
-  /*
+  /**
    * Restricts the HAL operation to a set of fingerprints belonging to a group
    * provided. The caller must provide a path to a storage location within the
    * user's data directory.
@@ -150,7 +150,7 @@
   setActiveGroup(uint32_t gid, string storePath)
       generates (RequestStatus debugErrno);
 
-  /*
+  /**
    * Authenticates an operation identified by operationId
    *
    * @param operationId operation id.