diff --git a/src/Data/ProcessedCodeCoverageData.php b/src/Data/ProcessedCodeCoverageData.php
index 976aaab38..49a103236 100644
--- a/src/Data/ProcessedCodeCoverageData.php
+++ b/src/Data/ProcessedCodeCoverageData.php
@@ -41,6 +41,7 @@
  *      }>
  *  }
  * @phpstan-type FunctionCoverageType array<string, array<string, FunctionCoverageDataType>>
+ * @phpstan-type LineCoverageType array<string, array<int, null|list<TestIdType>>>
  */
 final class ProcessedCodeCoverageData
 {
@@ -48,7 +49,7 @@ final class ProcessedCodeCoverageData
      * Line coverage data.
      * An array of filenames, each having an array of linenumbers, each executable line having an array of testcase ids.
      *
-     * @var array<string, array<int, null|list<TestIdType>>>
+     * @var LineCoverageType
      */
     private array $lineCoverage = [];
 
@@ -111,11 +112,17 @@ public function markCodeAsExecutedByTestCase(string $testCaseId, RawCodeCoverage
         }
     }
 
+    /**
+     * @param LineCoverageType $lineCoverage
+     */
     public function setLineCoverage(array $lineCoverage): void
     {
         $this->lineCoverage = $lineCoverage;
     }
 
+    /**
+     * @return LineCoverageType
+     */
     public function lineCoverage(): array
     {
         ksort($this->lineCoverage);
@@ -123,11 +130,17 @@ public function lineCoverage(): array
         return $this->lineCoverage;
     }
 
+    /**
+     * @param FunctionCoverageType $functionCoverage
+     */
     public function setFunctionCoverage(array $functionCoverage): void
     {
         $this->functionCoverage = $functionCoverage;
     }
 
+    /**
+     * @return FunctionCoverageType
+     */
     public function functionCoverage(): array
     {
         ksort($this->functionCoverage);
@@ -135,6 +148,9 @@ public function functionCoverage(): array
         return $this->functionCoverage;
     }
 
+    /**
+     * @return array<string>
+     */
     public function coveredFiles(): array
     {
         ksort($this->lineCoverage);