diff --git a/source/coral/io.cpp b/source/coral/io.cpp
index 1de6ca0..bb8d32f 100755
--- a/source/coral/io.cpp
+++ b/source/coral/io.cpp
@@ -85,6 +85,9 @@ export namespace coral {
 			return readable_data.length;
 		}
 
+		/**
+		 * Returns the remaining unfilled buffer space in bytes.
+		 */
 		usize remaining() const {
 			return capacity - this->data_filled;
 		}