diff --git a/aegisub/src/video_provider_cache.cpp b/aegisub/src/video_provider_cache.cpp
index 560a6fde2..3236f3213 100644
--- a/aegisub/src/video_provider_cache.cpp
+++ b/aegisub/src/video_provider_cache.cpp
@@ -137,7 +137,8 @@ void VideoProviderCache::ClearCache() {
 	}
 }
 
-
+/// @brief Get the current size of the cache
+/// @return Returns the size in bytes
 unsigned VideoProviderCache::GetCurCacheSize() {
 	int sz = 0;
 	for (std::list<CachedFrame>::iterator i = cache.begin(); i != cache.end(); i++)