Some comments

src/main/java/com/songoda/skyblock/listeners/Block.java

@@ -728,6 +728,7 @@ public class Block implements Listener {
         // placed.
         // This shouldn't cause any issues besides the task number being increased
         // insanely fast.
+        // TODO Do this only in 1.8.8
         Bukkit.getScheduler().runTask(skyblock, () -> {
             org.bukkit.block.Block block = location.getBlock();
             CompatibleMaterial material = CompatibleMaterial.getMaterial(block);

src/main/resources/config.yml

@@ -337,11 +337,16 @@ Island:
         # Should slime split bypass limits.yml
         AllowSlimeSplit: true
     Nether:
+        # Allow placing water in the Nether
         AllowNetherWater: false
+        # Water disappear when a nether mob walks into it
         WaterDisappearWithNetherMobs: false
+        # Block water from flowing near nether mobs EXPERIMENTAL!
         WaterDoNotFlowNearNetherMobs: false
+        # Make blaze immune from water in the Nether
         BlazeImmuneToWaterInNether: false
     Restrict:
+        # Blocks that can be placed only if the island has nether unlocked
         NetherBlocks:
             NETHERRACK: true
             SOUL_SAND: true
@@ -364,6 +369,7 @@ Island:
             NETHER_WART_BLOCK: true
             WITHER_SKELETON_SKULL: true
             WITHER_ROSE: true
+        # Blocks that can be placed only if the island has The End unlocked
         EndBlocks:
             END_STONE: true
             END_STONE_BRICKS: true