diff --git a/lab2/zad3/src/GF.st b/lab2/zad3/src/GF.st
index ae3b88b..b4ca62e 100644
--- a/lab2/zad3/src/GF.st
+++ b/lab2/zad3/src/GF.st
@@ -23,12 +23,14 @@ Object subclass: GF [
             ifTrue: [Error signal: 'both arguments must have the same characteristic']
     ]
 
+    "throws Error on different characteristics"
     + rhs [
         self verifyCharacteristics: rhs.
         ^GF create: characteristic
             withValue: ((value + rhs value) \\ characteristic)
     ]
 
+    "throws Error on different characteristics"
     - rhs [
         self verifyCharacteristics: rhs.
         "^GF create: characteristic
@@ -46,12 +48,15 @@ Object subclass: GF [
             ].
     ]
 
+    "throws Error on different characteristics"
     * rhs [
         self verifyCharacteristics: rhs.
         ^GF create: characteristic
             withValue: ((value * rhs value) \\ characteristic)
     ]
 
+    "throws ZeroDivide on division by 0"
+    "throws Error on different characteristics"
     / rhs [
         | inverse |
         self verifyCharacteristics: rhs.
@@ -67,44 +72,53 @@ Object subclass: GF [
             withValue: ((value * inverse) \\ characteristic)
     ]
 
+    "throws Error on different characteristics"
     = rhs [
         self verifyCharacteristics: rhs.
         ^value = rhs value
     ]
 
+    "throws Error on different characteristics"
     ~= rhs [
         self verifyCharacteristics: rhs.
         ^value ~= rhs value
     ]
 
+    "throws Error on different characteristics"
     > rhs [
         self verifyCharacteristics: rhs.
         ^value > rhs value
     ]
 
+    "throws Error on different characteristics"
     < rhs [
         self verifyCharacteristics: rhs.
         ^value < rhs value
     ]
 
+    "throws Error on different characteristics"
     >= rhs [
         self verifyCharacteristics: rhs.
         ^value >= rhs value
     ]
 
+    "throws Error on different characteristics"
     <= rhs [
         self verifyCharacteristics: rhs.
         ^value <= rhs value
     ]
-
+    
+    "returns the characteristic of `self`"
     characteristic [
         ^characteristic
     ]
 
+    "returns the value of `self`"
     value [
         ^value
     ]
 
+    "prints `self` in a pretty format"
     displayOn: stream [
         'GF<' displayOn: stream.
         characteristic displayOn: stream.