diff --git a/src/utl/assert.h b/src/utl/assert.h
index 80540f2..7896364 100644
--- a/src/utl/assert.h
+++ b/src/utl/assert.h
@@ -23,7 +23,7 @@
  * - cmc_assert_in_range
  * - cmc_assert_not_in_range
  *
- * Data types include:
+ * Data types (dtype) include:
  * - int8_t
  * - int16_t
  * - int32_t
@@ -37,8 +37,8 @@
  * - size_t
  * - float
  * - double
- * - ptr
- * - bool (only for equals and not_equals)
+ * - ptr       (only equals and not_equals)
+ * - bool      (only equals and not_equals)
  *
  * Specialized assertions that work with any data type:
  *
@@ -53,7 +53,6 @@
 
 #include <inttypes.h>
 #include <stdbool.h>
-#include <stdint.h>
 #include <stdio.h>
 #include <string.h>
 
@@ -105,25 +104,25 @@ static bool cmc_assert_state = true;
 
 /**
  * dtype    : One of the data types listed at the beggining of this file
- * (excluding ptr). boundary : Expected lowest possible value (excluded). actual
- * : Actual value tested against the given boundary.
+ * boundary : Expected lowest possible value (excluded).
+ * actual   : Actual value tested against the given boundary.
  */
 #define cmc_assert_greater(dtype, boundary, actual) \
     CMC_ASSERT_GLUE(dtype, greater)                 \
     (boundary, actual)
 
 /**
- * dtype    : One of the data types listed at the beggining of this file
- * (excluding ptr). boundary : Expected lowest possible value (included). actual
- * : Actual value tested against the given boundary.
+ * dtype    : One of the data types listed at the beggining of this file.
+ * boundary : Expected lowest possible value (included).
+ * actual   : Actual value tested against the given boundary.
  */
 #define cmc_assert_greater_equals(dtype, boundary, actual) \
     CMC_ASSERT_GLUE(dtype, greater_equals)                 \
     (boundary, actual)
 
 /**
- * dtype    : One of the data types listed at the beggining of this file
- * (excluding ptr). boundary : Expected highest possible value (excluded).
+ * dtype    : One of the data types listed at the beggining of this file.
+ * boundary : Expected highest possible value (excluded).
  * actual   : Actual value tested against the given boundary.
  */
 #define cmc_assert_lesser(dtype, boundary, actual) \
@@ -131,8 +130,8 @@ static bool cmc_assert_state = true;
     (boundary, actual)
 
 /**
- * dtype    : One of the data types listed at the beggining of this file
- * (excluding ptr). boundary : Expected highest possible value (included).
+ * dtype    : One of the data types listed at the beggining of this file.
+ * boundary : Expected highest possible value (included).
  * actual   : Actual value tested against the given boundary.
  */
 #define cmc_assert_lesser_equals(dtype, boundary, actual) \
@@ -140,8 +139,8 @@ static bool cmc_assert_state = true;
     (boundary, actual)
 
 /**
- * dtype       : One of the data types listed at the beggining of this file
- * (excluding ptr). lower_bound : Smallest value of the expected range.
+ * dtype       : One of the data types listed at the beggining of this file.
+ * lower_bound : Smallest value of the expected range.
  * upper_bound : Highest value of the expected range.
  * actual      : Actual value tested against the given range.
  *
@@ -152,8 +151,8 @@ static bool cmc_assert_state = true;
     (lower_bound, upper_bound, actual)
 
 /**
- * dtype       : One of the data types listed at the beggining of this file
- * (excluding ptr). lower_bound : Smallest value of the not expected range.
+ * dtype       : One of the data types listed at the beggining of this file.
+ * lower_bound : Smallest value of the not expected range.
  * upper_bound : Highest value of the not expected range.
  * actual      : Actual value tested against the given range.
  *
@@ -260,13 +259,14 @@ static bool cmc_assert_state = true;
     } while (0)
 
 /**
- * Assert that each element in the array are within bounds.
+ * Assert that each element in the array are out of bounds.
  *
  * dtype       : The type of the array.
- * array       : Array to be checked if its elements are outside of a given
- * range comparator  : A function that has two 'dtype' arguments and returns -1
- * if the first is less then the second, 0 if both are equal or 1 if the first
- * is greater then the second. lower_bound : Smallest value of the given range.
+ * array       : Array to be checked if its elements are outside a given range.
+ * comparator  : A function that has two 'dtype' arguments and returns -1 if the
+ *               first is less then the second, 0 if both are equal or 1 if the
+ *               first is greater then the second.
+ * lower_bound : Smallest value of the given range.
  * upper_bound : Highest value of the given range.
  * from_index  : First index from the array to compare (inclusive).
  * to_index    : Last index from the array to compare (inclusive).
diff --git a/src/utl/foreach.h b/src/utl/foreach.h
index 11362cd..52e7c89 100644
--- a/src/utl/foreach.h
+++ b/src/utl/foreach.h
@@ -8,6 +8,15 @@
  *
  */
 
+/**
+ * For-Each macros that work with all Collections within the library.
+ *
+ * PFX      - Functions prefix
+ * SNAME    - Struct name
+ * ITERNAME - Iterator variable name
+ * TARGET   - Target variable
+ */
+
 #ifndef CMC_FOR_EACH_H
 #define CMC_FOR_EACH_H
 
diff --git a/src/utl/log.h b/src/utl/log.h
index 2f05e68..a843f4c 100644
--- a/src/utl/log.h
+++ b/src/utl/log.h
@@ -18,11 +18,11 @@
  */
 
 /**
- * What each error code means
+ * What each error code means inside the DEV Collections
  *
  * TRACE - Trace is used to describe the inner workings of the function or an
  *         algorithm. It can be useful when trying to find for an error in the
- *         algorithm or an untreated case.
+ *         algorithm or corner cases.
  * DEBUG - Mainly used for debugging, tracking certain variables or anything
  *         useful to help visualizing what your program is doing.
  *  INFO - Info can be used as a heads up. It is also used to track the main
@@ -31,7 +31,7 @@
  *         from and they are usually treated by it. In most cases the user can
  *         treat these warnings himself.
  * ERROR - Something really bad happened. Your program will not crash yet but
- *         depending on what comes next, it might crash indeed.
+ *         depending on what comes next, it will.
  * FATAL - This will probably be the last logging message before your program
  *         crashes or goes into madness. Fatal errors are commonly attributed
  *         to dereferencing NULL pointers.
@@ -45,7 +45,7 @@
  * ERROR - 5
  * FATAL - 6
  *
- * How the Log Level is calculated
+ * How the Log Level is calculated for tlevel and flevel
  *
  * - If the log level is 0 all logs are enabled.
  * - If the log level (X) is positive:
diff --git a/src/utl/test.h b/src/utl/test.h
index c56d05f..cdd7493 100644
--- a/src/utl/test.h
+++ b/src/utl/test.h
@@ -27,17 +27,8 @@
  *     Parameters:
  *         - TNAME : Test name (const char *)
  *         - BODY  : Block of code containing a specific test
- *     Inside the BODY use the following macros:
- *         - CMC_TEST_PASS
- *             Pass current test.
- *         - CMC_TEST_FAIL
- *             Fail current test.
- *         - CMC_TEST_PASS_ELSE_FAIL
- *             If given expression is true, pass current test, else fail.
- *         - CMC_TEST_ABORT
- *             Abort current unit test and displays error message. All tests
- *             after the abort won't be called.
- *     All of these macros can only be called once per test.
+ *     Inside the BODY use the macros in ./utl/assert.h. The unit test will keep
+ *     track of cmc_assert_state and automatically pass or fail tests.
  *
  * CMC_TEST_COLOR
  *      Define this macro to allow colored output.
@@ -46,14 +37,13 @@
 #ifndef CMC_TEST_H
 #define CMC_TEST_H
 
-#include "assert.h"
-#include "timer.h"
 #include <inttypes.h>
 #include <stdbool.h>
-#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
+
+#include "assert.h"
+#include "timer.h"
 
 #ifdef CMC_TEST_COLOR
 static const char *cmc_test_color[] = { "\x1b[32m", "\x1b[31m", "\x1b[35m" };
@@ -84,7 +74,7 @@ static void cmc_test_log(const char *unit_name, const char *current_test,
     else
     {
 #ifdef CMC_TEST_COLOR
-        printf("Test from %s %s%7s\x1b[0m %s\n", unit_name,
+        printf("Test from \x1b[33m%s\x1b[0m %s%7s\x1b[0m %s\n", unit_name,
                passed ? cmc_test_color[0] : cmc_test_color[1],
                passed ? "PASSED" : "FAILED", current_test);
 #else
diff --git a/src/utl/timer.h b/src/utl/timer.h
index 95252f4..1cdb513 100644
--- a/src/utl/timer.h
+++ b/src/utl/timer.h
@@ -8,7 +8,9 @@
  *
  */
 
-/* Simple timer macros utility */
+/**
+ *  Simple timer macros utility for timing code execution.
+ */
 
 #ifndef CMC_TIMER_H
 #define CMC_TIMER_H
@@ -19,7 +21,7 @@ struct cmc_timer
 {
     clock_t start;
     clock_t stop;
-    double result;
+    double result; /* The result is given in milliseconds */
 };
 
 #define cmc_timer_start(timer)          \