diff --git a/Programming Basics/Summary 1/Exercise 4/task.md b/Programming Basics/Summary 1/Exercise 4/task.md
index 59ec23ea..0b3797fd 100644
--- a/Programming Basics/Summary 1/Exercise 4/task.md	
+++ b/Programming Basics/Summary 1/Exercise 4/task.md	
@@ -5,3 +5,16 @@ This exercise modifies `Overflow.kt` to test `Long` and `Double`. Implement
 `testDouble()` display the `Double` maximum value incremented by `1`. Make
 `testDouble2()` display the result of comparing `Double.MAX_VALUE` and
 `Double.MAX_VALUE + 1`.
+
+The `Double` type usually occupies 64 bits in memory.
+Because of memory constraints, `Double` represents numbers with some
+precision. 
+You can read more about its internal representation on 
+[Wikipedia](https://en.wikipedia.org/wiki/Double-precision_floating-point_format).
+
+The `Double.MAX_VALUE` constant has a special meaning: it holds the largest
+positive finite value of `Double`. You can't increase it; if you try to add
+a positive number to it, it results in the same maximum value. It works somewhat 
+similarly to `Double.POSITIVE_INFINITY`: it's a constant with special treatment
+holding the positive infinity value of `Double`. You can use these constants
+for comparisons with regular `Double` values.