diff --git a/Codes/Group A/Assignment-A3/README.md b/Codes/Group A/Assignment-A3/README.md
index 4bb9789..cea8072 100644
--- a/Codes/Group A/Assignment-A3/README.md	
+++ b/Codes/Group A/Assignment-A3/README.md	
@@ -31,6 +31,9 @@ javac -h . A3.java
 gcc -shared -o libA3.so -fPIC -I"$JAVA_HOME/include" -I"$JAVA_HOME/include/linux" A3.c
 ```
 
+> [!NOTE]
+> If you get an error saying _"fatal error: jni.h: No such file or directory"_, this might be because you haven't set `$JAVA_HOME` environment variable. Usually JVM stuff is in `/usr/lib/jvm/java-<version>-openjdk-amd64`. To set `JAVA_HOME` environment variable, run: `export $JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64` (for version 17, adjust for your version accordingly.)
+
 4. Run program:
 ```shell
 java -Djava.library.path=. A3
@@ -47,7 +50,7 @@ javac A3.java
 javac -h . A3.java
 ```
 
-3. Set JAVA_HOME to the path of your jdk file location:
+3. Set `JAVA_HOME` to the path of your jdk file location:
 > Note that this is my file location for jdk. It may differ for you.
 ```shell
 set JAVA_HOME=C:\Program Files\openjdk-23.0.1_windows-x64_bin\jdk-23.0.1
@@ -61,4 +64,4 @@ gcc -shared -o A3.dll -fPIC -I"%JAVA_HOME%\include" -I"%JAVA_HOME%\include\win32
 5. Run program:
 ```shell
 java -Djava.library.path=. A3
-```
\ No newline at end of file
+```