diff --git a/plugins/include/core.inc b/plugins/include/core.inc
index 039954a0..7b8ba5f9 100755
--- a/plugins/include/core.inc
+++ b/plugins/include/core.inc
@@ -10,33 +10,193 @@
 #endif
 #define _core_included
 
+/**
+ * Returns the free memory space available to the plugin.
+ *
+ * @note This is a debugging function that is not intended for general plugin
+ *       use.
+ *
+ * @return  Free memory space in bytes
+ */
 native heapspace();
 
+/**
+ * Returns the function index of a public function declared in the plugin.
+ *
+ * @param name  Function name
+ *
+ * @return      Function index > 0 on success, -1 if function was not found
+ * @error       If the function name is too long (longer than 63 characters)
+ *              an error will be thrown.
+ */
 native funcidx(const name[]);
 
+/**
+ * Returns the number of arguments passed into the currently executed function.
+ *
+ * @return  Number of arguments passed
+ */
 native numargs();
-native getarg(arg, index=0);
-native setarg(arg, index=0, value);
 
+/**
+ * Retrieves an argument value passed into the currently executed function.
+ *
+ * @param arg       Argument index
+ * @param index     Index to retrieve from the argument (for arrays and strings)
+ *
+ * @return          Argument value at given index
+ */
+native getarg(arg, index = 0);
+
+/**
+ * Sets the value of an argument passed into the currently executed function.
+ *
+ * @note This is not equal to assigning a new value to a by-reference argument.
+ *
+ * @param arg       Argument index
+ * @param index     Index to set in the argument (for arrays and strings)
+ */
+native setarg(arg, index = 0, value);
+
+/**
+ * Converts a character to lowercase.
+ *
+ * @note This is not UTF8 or locale-safe.
+ *
+ * @param c     Character to convert
+ *
+ * @return      Converted character
+ */
 native tolower(c);
+
+/**
+ * Converts a character to uppercase.
+ *
+ * @note This is not UTF8 or locale-safe.
+ *
+ * @param c     Character to convert
+ *
+ * @return      Converted character
+ */
 native toupper(c);
+
+/**
+ * Swaps the bytes of a value (the lowest byte becomes the highest byte).
+ *
+ * @param c     Value to swap
+ *
+ * @return      Byte-swapped value
+ */
 native swapchars(c);
 
+/**
+ * Returns a random number between 0 and a specified upper bound.
+ *
+ * @param max   Exclusive upper bound
+ *
+ * @return      Random value
+ */
 native random(max);
 
+/**
+ * Returns the smaller of two provided values.
+ *
+ * @param value1    Value one
+ * @param value2    Value two
+ *
+ * @return          Smaller of the two values
+ */
 native min(value1, value2);
-native max(value1, value2);
-native clamp(value, min=cellmin, max=cellmax);
 
+/**
+ * Returns the bigger of two provided values.
+ *
+ * @param value1    Value one
+ * @param value2    Value two
+ *
+ * @return          Bigger of the two values
+ */
+native max(value1, value2);
+
+/**
+ * Limits a provided value between two specified bounds.
+ *
+ * @param value     Value to clamp
+ * @param min       Lower bound
+ * @param max       Upper bound
+ *
+ * @return          The value if it is between the lower and upper bound, min if
+ *                  value is below, max if it is above the specified bounds.
+ */
+native clamp(value, min = cellmin, max = cellmax);
+
+/**
+ * Returns a value raised to a specified exponent.
+ *
+ * @param value     Value
+ * @param exponent  Exponent to raise value to
+ *
+ * @return          Value to the power of exponent
+ */
 native power(value, exponent);
+
+/**
+ * Returns the approximated square root of a value.
+ *
+ * @note This uses a simple successice approximation algorithm (continuously
+ *       dividing the value) and only deals with integers, this makes it very
+ *       imprecise.
+ *
+ * @param value     Value
+ *
+ * @return          Square root of the value
+ */
 native sqroot(value);
 
-native time(&hour=0,&minute=0,&second=0);
-native date(&year=0,&month=0,&day=0);
+/**
+ * Retrieves the current time in hours, minutes and seconds.
+ *
+ * @param hour      Variable to store hours in
+ * @param minute    Variable to store minutes in
+ * @param second    Variable to store seconds in
+ *
+ * @return          Unix timestamp
+ */
+native time(&hour = 0, &minute = 0, &second = 0);
 
-native tickcount(&granularity=0);
+/**
+ * Retrieves the current date in year, month and day.
+ *
+ * @param hour      Variable to store year in
+ * @param minute    Variable to store month in
+ * @param second    Variable to store day in
+ *
+ * @noreturn
+ */
+native date(&year = 0, &month = 0, &day = 0);
 
+/**
+ * Returns the elapsed CPU seconds.
+ *
+ * @note This is a debugging function that is not intended for general plugin
+ *       use.
+ * @note This uses the C clock() function internally and comes with all its
+ *       drawbacks attached.
+ *
+ * @param granularity   Unused
+ *
+ * @return              Number of CPU seconds elapsed
+ */
+native tickcount(&granularity = 0);
+
+/**
+ * Returns the absolute value of a number.
+ *
+ * @param x     Integral value
+ *
+ * @return      Absolute value of x (x if it is greater than 0, -x otherwise)
+ */
 stock abs(x)
 {
-	return x > 0 ? x : -x;
+    return x > 0 ? x : -x;
 }