diff --git a/packages/kotlin/1.4.31/build.sh b/packages/kotlin/1.4.31/build.sh
index e921dd5..c00cb27 100755
--- a/packages/kotlin/1.4.31/build.sh
+++ b/packages/kotlin/1.4.31/build.sh
@@ -1,10 +1,13 @@
 #!/usr/bin/env bash
 
-source ../../java/15.0.2/build.sh
+# Download and extract JDK8
+curl -L "https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u292-b10/OpenJDK8U-jdk_x64_linux_hotspot_8u292b10.tar.gz" -o jdk.tar.gz
+tar xzf jdk.tar.gz --strip-components=1
+rm jdk.tar.gz
 
+# Download and extract Kotlin
 curl -L "https://github.com/JetBrains/kotlin/releases/download/v1.4.31/kotlin-compiler-1.4.31.zip" -o kotlin.zip
 unzip kotlin.zip
 rm kotlin.zip
-
 cp -r kotlinc/* .
 rm -rf kotlinc
diff --git a/packages/kotlin/1.4.31/compile b/packages/kotlin/1.4.31/compile
index 027ade0..9b49562 100644
--- a/packages/kotlin/1.4.31/compile
+++ b/packages/kotlin/1.4.31/compile
@@ -1,7 +1,6 @@
 #!/usr/bin/env bash
 
-# Put instructions to compile source code, remove this file if the language does not require this stage
-
 rename 's/$/\.kt/' "$@" # Add .kt extension
 
-kotlinc *.kt -include-runtime -d code.jar
\ No newline at end of file
+# Compile Kotlin code to a jar file
+kotlinc *.kt -include-runtime -d code.jar
diff --git a/packages/kotlin/1.4.31/environment b/packages/kotlin/1.4.31/environment
index 780b668..aadd2e5 100644
--- a/packages/kotlin/1.4.31/environment
+++ b/packages/kotlin/1.4.31/environment
@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 
-# Put 'export' statements here for environment variables
+# Add java and kotlinc to path
 export PATH=$PWD/bin:$PATH
diff --git a/packages/kotlin/1.4.31/run b/packages/kotlin/1.4.31/run
index d7c9501..e5713a3 100644
--- a/packages/kotlin/1.4.31/run
+++ b/packages/kotlin/1.4.31/run
@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 
-# Put instructions to run the runtime
-java -jar code.jar
\ No newline at end of file
+# Run jar file
+java -jar code.jar
diff --git a/packages/kotlin/1.4.31/test.kt b/packages/kotlin/1.4.31/test.kt
index 31acf7b..0c9540f 100644
--- a/packages/kotlin/1.4.31/test.kt
+++ b/packages/kotlin/1.4.31/test.kt
@@ -1,3 +1,3 @@
 fun main() {
     println("OK")
-}
\ No newline at end of file
+}