diff --git a/Codes/Group A/Assignment-A3/A3.h b/Codes/Group A/Assignment-A3/A3.h
new file mode 100644
index 0000000..f2002a1
--- /dev/null
+++ b/Codes/Group A/Assignment-A3/A3.h	
@@ -0,0 +1,45 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class A3 */
+
+#ifndef _Included_A3
+#define _Included_A3
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     A3
+ * Method:    add
+ * Signature: (II)I
+ */
+JNIEXPORT jint JNICALL Java_A3_add
+  (JNIEnv *, jobject, jint, jint);
+
+/*
+ * Class:     A3
+ * Method:    sub
+ * Signature: (II)I
+ */
+JNIEXPORT jint JNICALL Java_A3_sub
+  (JNIEnv *, jobject, jint, jint);
+
+/*
+ * Class:     A3
+ * Method:    mul
+ * Signature: (II)I
+ */
+JNIEXPORT jint JNICALL Java_A3_mul
+  (JNIEnv *, jobject, jint, jint);
+
+/*
+ * Class:     A3
+ * Method:    div
+ * Signature: (II)I
+ */
+JNIEXPORT jint JNICALL Java_A3_div
+  (JNIEnv *, jobject, jint, jint);
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/Codes/Group A/Assignment-A3/EXPLANATION.md b/Codes/Group A/Assignment-A3/EXPLANATION.md
index 3bdf4ee..5dd85be 100644
--- a/Codes/Group A/Assignment-A3/EXPLANATION.md	
+++ b/Codes/Group A/Assignment-A3/EXPLANATION.md	
@@ -7,6 +7,7 @@ This file contains explanation for dynamic linking library program (Assignment-A
 Please note the files referred in this guide:
 - [A3.java](https://git.kska.io/sppu-te-comp-content/SystemsProgrammingAndOperatingSystem/src/branch/main/Codes/Group%20A/Assignment-A3/A3.java)
 - [A3.c](https://git.kska.io/sppu-te-comp-content/SystemsProgrammingAndOperatingSystem/src/branch/main/Codes/Group%20A/Assignment-A3/A3.c)
+- [A3.h](https://git.kska.io/sppu-te-comp-content/SystemsProgrammingAndOperatingSystem/src/branch/main/Codes/Group%20A/Assignment-A3/A3.h)
 
 ---
 
@@ -20,7 +21,7 @@ Please note the files referred in this guide:
 - There will be a new file called `A3.h` in your current working directory,
   - This is the header file.
   - It contains signatures for native functions we created in the Java file.
-  - Thus, there's **no need to memorized `A3.c` file** since the functions defined in that file can be found in the header file.
+  - Thus, there's **no need to memorized boilerplate in `A3.c`** since the functions defined in that file can be found in the header file. I have included the [A3.h](https://git.kska.io/sppu-te-comp-content/SystemsProgrammingAndOperatingSystem/src/branch/main/Codes/Group%20A/Assignment-A3/A3.h) file in this folder for reference. Note that it is automatically generated.
 - Create a new `A3.c` file which is the C program file containing function definitions (for add, sub, mul, div)
   - Define all the functions (add, sub, mul, div)
 - Then, we have to compile the C program file, i.e. `A3.c`. For this, run `gcc -shared -o libA3.so -fPIC -I"$JAVA_HOME/include" -I"$JAVA_HOME/include/linux" A3.c`,