diff --git a/src/mvi/gpgmm.h b/src/mvi/gpgmm.h
index d6379e107..32994b6cd 100644
--- a/src/mvi/gpgmm.h
+++ b/src/mvi/gpgmm.h
@@ -45,6 +45,9 @@ namespace gpgmm {
         MemoryAllocatorStats mStats = {};
     };
 
+    // MemoryAllocation represents a range of memory. A MemoryAllocation object will be held alive
+    // until MemoryAllocator::DeallocateMemory is called on the MemoryAllocator object from which it
+    // was originally created.
     class MemoryAllocation {
       public:
         MemoryAllocation(MemoryAllocator* allocator, MemoryBase* memory);