diff --git a/.github/workflows/arduino-lint.yml b/.github/workflows/arduino-lint.yml
index 4201286..287b3ef 100644
--- a/.github/workflows/arduino-lint.yml
+++ b/.github/workflows/arduino-lint.yml
@@ -1,4 +1,4 @@
-name: Aarduino-lint
+name: arduino-lint
 on: [push, pull_request]
 jobs:
   lint:
@@ -7,4 +7,6 @@ jobs:
       - uses: actions/checkout@v2
       - uses: arduino/arduino-lint-action@v1
         with:
-          library-manager: update      
+          library-manager: update
+          compliance: strict
+
diff --git a/README.md b/README.md
index 979b8f3..9a15ef0 100644
--- a/README.md
+++ b/README.md
@@ -16,10 +16,6 @@ int readValue();
 
 int readValue(void *buff, unsigned int byteNum);
 
-void compareKeyExactly();
-
-void compareHashOnly();
-
 cdbResult close();
 ```    
 
diff --git a/examples/airports/airports.ino b/examples/airports/airports.ino
index 0d5f48d..079f13c 100644
--- a/examples/airports/airports.ino
+++ b/examples/airports/airports.ino
@@ -71,8 +71,6 @@ void setup() {
   SD.begin(10);
 
   if (ucdb.open(fileName) == CDB_OK) {
-    // ucdb.compareHashOnly();
-
     // Find some existing codes.
     for (unsigned int i = 0; i < sizeof (air) / sizeof (const char *); i++) {
       query(air[i], strlen(air[i]));
diff --git a/library.properties b/library.properties
index 002e618..e7ecf8d 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=uCDB
-version=0.3.0
+version=0.4.0
 author=Ioulianos Kakoulidis
 maintainer=Ioulianos Kakoulidis <ioulianos.kakoulidis@hotmail.com>
 sentence=API for querying Constant DataBase file store.
diff --git a/src/uCDB.cpp b/src/uCDB.cpp
index da47b7d..7b5b4b2 100644
--- a/src/uCDB.cpp
+++ b/src/uCDB.cpp
@@ -15,7 +15,6 @@
 static unsigned long unpack(const byte buff[]);
 
 uCDB::uCDB() {
-  cmp = COMPARE_KEY_EXACTLY;
   state = CDB_CLOSED;
 }
 
@@ -173,22 +172,8 @@ cdbResult uCDB::findNextValue() {
       
       valueBytesAvail = dataValueLen;
 
-      switch (cmp) {
-        case COMPARE_HASH_ONLY:
-          if (cdb.seek(dataPos + CDB_DESCRIPTOR_SIZE + dataKeyLen)) {
-            return (state = KEY_FOUND);              
-          }
-          else {
-            return (state = FILE_ERROR);
-          }
-
-        default:
-          if (keyLen_ != dataKeyLen) {
-            break; // Scan next slot
-          }
-          if (compareKey() == KEY_FOUND) {
-            return (state = KEY_FOUND);
-          }
+      if ((keyLen_ == dataKeyLen) & (compareKey() == KEY_FOUND)) {
+        return (state = KEY_FOUND);          
       }
     }
   }
@@ -226,14 +211,6 @@ int uCDB::readValue(void *buff, unsigned int byteNum) {
   return cdb.read(buff, byteNum);
 }
 
-void uCDB::compareKeyExactly() {
-  cmp = COMPARE_KEY_EXACTLY;
-}
-
-void uCDB::compareHashOnly() {
-  cmp = COMPARE_HASH_ONLY;
-}
-
 cdbResult uCDB::close() {
   cdb.close();
   return (state = CDB_CLOSED);
diff --git a/src/uCDB.h b/src/uCDB.h
index 4b2b352..7d18615 100644
--- a/src/uCDB.h
+++ b/src/uCDB.h
@@ -13,12 +13,6 @@
 #include <SPI.h>
 #include <SD.h>
 
-/** Key compare rule type */
-enum compareRule {
-  COMPARE_KEY_EXACTLY = 0, //< Match key exactly (key hash, key length, key)
-  COMPARE_HASH_ONLY        //< Match only key hash (key hash)
-};
-
 enum cdbResult {
   CDB_OK = 0,
   CDB_CLOSED, // Initial state
@@ -65,9 +59,6 @@ class uCDB
     */
     int readValue(void *buff, unsigned int byteNum);
 
-    void compareKeyExactly();
-    void compareHashOnly();
-
     /**
         Close CDB
     */
@@ -76,7 +67,6 @@ class uCDB
   private:
     File cdb;
     cdbResult state;
-    compareRule cmp;
 
     const byte *key_;
     unsigned long keyLen_;