diff --git a/exercises/04_primitive_types/primitive_types1.rs b/exercises/04_primitive_types/primitive_types1.rs
index 0002651d..750d6e55 100644
--- a/exercises/04_primitive_types/primitive_types1.rs
+++ b/exercises/04_primitive_types/primitive_types1.rs
@@ -1,14 +1,12 @@
-// Fill in the rest of the line that has code missing!
-
 fn main() {
-    // Booleans (`bool`)
-
     let is_morning = true;
     if is_morning {
         println!("Good morning!");
     }
 
-    let // Finish the rest of this line like the example! Or make it be false!
+    // TODO: Define a boolean variable with the name `is_evening` before the `if` statement below.
+    // The value of the variable should be the negation (opposite) of `is_morning`.
+    // let …
     if is_evening {
         println!("Good evening!");
     }
diff --git a/rustlings-macros/info.toml b/rustlings-macros/info.toml
index 39fc5c4d..59de7f25 100644
--- a/rustlings-macros/info.toml
+++ b/rustlings-macros/info.toml
@@ -234,7 +234,10 @@ hint = "No hints this time ;)"
 name = "primitive_types1"
 dir = "04_primitive_types"
 test = false
-hint = "No hints this time ;)"
+hint = """
+In Rust, a boolean can be negated using the operator `!` before it.
+Example: `!true == false`
+This also works with boolean variables."""
 
 [[exercises]]
 name = "primitive_types2"
diff --git a/solutions/04_primitive_types/primitive_types1.rs b/solutions/04_primitive_types/primitive_types1.rs
index 4e181989..fac6ec04 100644
--- a/solutions/04_primitive_types/primitive_types1.rs
+++ b/solutions/04_primitive_types/primitive_types1.rs
@@ -1 +1,11 @@
-// Solutions will be available before the stable release. Thank you for testing the beta version 🥰
+fn main() {
+    let is_morning = true;
+    if is_morning {
+        println!("Good morning!");
+    }
+
+    let is_evening = !is_morning;
+    if is_evening {
+        println!("Good evening!");
+    }
+}