some minor comment nitpick

autoreload.c

@@ -85,7 +85,7 @@ void arl_add(arl_t *arl, const char *filepath)
 	add_watch(arl->fd, &arl->wd_file, filepath, IN_CLOSE_WRITE | IN_DELETE_SELF);
 
 	base = strrchr(filepath, '/');
-	assert(base != NULL); /* filepath must be result of `realpath(3)` */
+	assert(base != NULL && "filepath must be result of realpath(3)");
 	dir = arl_scratch_push(filepath, MAX(base - filepath, 1));
 	add_watch(arl->fd, &arl->wd_dir, dir, IN_CREATE | IN_MOVED_TO);
 	arl->filename = arl_scratch_push(base + 1, strlen(base + 1));

main.c

@@ -460,7 +460,6 @@ static void update_info(void)
 		open_title();
 	}
 
-	/* update bar contents */
 	if (win.bar.h == 0 || extprefix)
 		return;
 
@@ -841,7 +840,7 @@ static void run(void)
 			}
 		} while (discard);
 
-		switch (ev.type) { /* handle events */
+		switch (ev.type) {
 		case ButtonPress:
 			on_buttonpress(&ev.xbutton);
 			break;

nsxiv.h

@@ -101,7 +101,7 @@ typedef enum {
 
 typedef struct {
 	const char *name; /* as given by user */
-	const char *path; /* always absolute */
+	const char *path; /* always absolute, result of realpath(3) */
 	fileflags_t flags;
 } fileinfo_t;
 
@@ -265,7 +265,7 @@ struct opt {
 	/* window: */
 	bool fullscreen;
 	bool hide_bar;
-	Window embed; /* unsigned long */
+	Window embed;
 	char *geometry;
 	char *res_name;
 

thumbs.c

@@ -43,7 +43,7 @@ static char *tns_cache_filepath(const char *filepath)
 	size_t len;
 	char *cfile = NULL;
 
-	assert(*filepath == '/' && "filepath should be result of realpath(3)");
+	assert(*filepath == '/' && "filepath must be result of realpath(3)");
 
 	if (strncmp(filepath, cache_dir, strlen(cache_dir)) != 0) {
 		/* don't cache images inside the cache directory! */