diff --git a/c-programming/io/freadln.c b/c-programming/io/freadln.c
index 5e54bf4..80888da 100644
--- a/c-programming/io/freadln.c
+++ b/c-programming/io/freadln.c
@@ -33,7 +33,7 @@ int freadln(FILE* f, char** output, size_t* length_out) {
 	// make sure a prompt is displayed
 	fflush(stdout);
 
-	freadln_length_type length = 0;
+	freadln_length_type length = 0; // initial length
 
 	*output = malloc((length + 1) * sizeof(char));
 	if (*output == NULL)