diff --git a/src/main/java/ru/bclib/api/BiomeAPI.java b/src/main/java/ru/bclib/api/BiomeAPI.java
index fb74f10d..d02f34d9 100644
--- a/src/main/java/ru/bclib/api/BiomeAPI.java
+++ b/src/main/java/ru/bclib/api/BiomeAPI.java
@@ -143,7 +143,7 @@ public class BiomeAPI {
 	/**
 	 * Check if biome with {@link ResourceLocation} exists in API registry.
 	 * @param biomeID - biome {@link ResourceLocation}.
-	 * @return 
+	 * @return {@code true} if biome exists in API registry and {@code false} if not.
 	 */
 	public static boolean hasBiome(ResourceLocation biomeID) {
 		return ID_MAP.containsKey(biomeID);
diff --git a/src/main/java/ru/bclib/api/DataFixerAPI.java b/src/main/java/ru/bclib/api/DataFixerAPI.java
index 503abe26..559fc7d5 100644
--- a/src/main/java/ru/bclib/api/DataFixerAPI.java
+++ b/src/main/java/ru/bclib/api/DataFixerAPI.java
@@ -24,6 +24,7 @@ public class DataFixerAPI {
 	private static final Map<String, Integer> FIX_VERSIONS = Maps.newHashMap();
 	
 	public static void fixData(File dir) {
+		REPLACEMENT.clear(); // API is not finished yet!
 		if (REPLACEMENT.isEmpty()) {
 			return;
 		}
@@ -117,7 +118,7 @@ public class DataFixerAPI {
 	/**
 	 * Get mod version from string. String should be in format: %d.%d.%d
 	 * @param version - {@link String} mod version.
-	 * @return
+	 * @return int mod version.
 	 */
 	public static int getModVersion(String version) {
 		if (version.isEmpty()) {
@@ -134,8 +135,8 @@ public class DataFixerAPI {
 	
 	/**
 	 * Get mod version from integer. String will be in format %d.%d.%d
-	 * @param version
-	 * @return
+	 * @param version - mod version in integer form.
+	 * @return {@link String} mod version.
 	 */
 	public static String getModVersion(int version) {
 		int a = (version >> 12) & 63;
diff --git a/src/main/java/ru/bclib/util/BlocksHelper.java b/src/main/java/ru/bclib/util/BlocksHelper.java
index 9b5436ea..78d79a12 100644
--- a/src/main/java/ru/bclib/util/BlocksHelper.java
+++ b/src/main/java/ru/bclib/util/BlocksHelper.java
@@ -131,7 +131,7 @@ public class BlocksHelper {
 
 	/**
 	 * Creates a new {@link Direction} array with clockwise order:
-	 * NORTH -> EAST -> SOUTH -> WEST
+	 * NORTH, EAST, SOUTH, WEST
 	 * @return Array of {@link Direction}.
 	 */
 	public static Direction[] makeHorizontal() {
diff --git a/src/main/java/ru/bclib/util/WeightedList.java b/src/main/java/ru/bclib/util/WeightedList.java
index e8ad35ef..dcf8daac 100644
--- a/src/main/java/ru/bclib/util/WeightedList.java
+++ b/src/main/java/ru/bclib/util/WeightedList.java
@@ -77,7 +77,7 @@ public class WeightedList<T> {
 	 * Makes a sublist of this list with same weights. Used only in {@link WeighTree}
 	 * @param start - {@code int} start index (inclusive).
 	 * @param end - {@code int} end index (exclusive).
-	 * @return {@link WeightedList<T>}.
+	 * @return {@link WeightedList}.
 	 */
 	protected WeightedList<T> subList(int start, int end) {
 		WeightedList<T> list = new WeightedList<T>();