1 files changed, 2 insertions, 0 deletions
diff --git a/tex.c b/tex.c
index 11c09f7..a24a430 100644
--- a/tex.c
+++ b/tex.c
@@ -9,6 +9,7 @@
 #include "eprintf.h"
 #include "tex.h"
 
+// png2tex: read a PNG and produce an OpenGL texture out of it
 GLuint png2tex(FILE *f)
 {
 	png_image pi = { .version = PNG_IMAGE_VERSION };
@@ -21,6 +22,7 @@ GLuint png2tex(FILE *f)
 	png_image_begin_read_from_stdio(&pi, f);
 	pi.format = PNG_FORMAT_RGB;
 	stride = sizeof *data * PNG_IMAGE_SAMPLE_CHANNELS(pi.format) * pi.width;
+	// OpenGL alignment requirement
 	stride = (stride + 3) & ~(size_t)3;
 	size = stride * pi.height;
 	data = emalloc(size);