diff --git a/doc/testing.md b/doc/testing.md
index 787c4a9..20a2311 100644
--- a/doc/testing.md
+++ b/doc/testing.md
@@ -8,4 +8,8 @@ The [file](id_000000_00_EXCEPTION_ACCESS_VIOLATION.caff) which caused the progra
 ![Output of ALF](afl.png)
 
 # Valgrind
-We used the file generated by AFL during testing with valgrind.
\ No newline at end of file
+We used the file generated by AFL during testing with valgrind.
+
+The error reported by valgrind was the following: Invalid read of size 1
+
+This means that the memory location the process was trying to read from is outside of the memory addresses available to the process.
\ No newline at end of file