diff --git a/src/main.cpp b/src/main.cpp
index 3f57ac3..9f2187c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2,10 +2,9 @@
 /*
  * TODO:
  * - impulsive orbital maneuvers
- * - update libTangerine to only use xyzw parameters: GLM_FORCE_XYZW_ONLY
+ * - remove inline functions from orbits.h
  * - replace instances of glm:: with using directives
  * - compile with '-pedantic' and fix macro warnings
- * - convert between satellite state vectors and orbital elements
  * - orbits with nu (true anom at T0) other than 0 degrees
  * - plane change maneuvers
  * - Hohmman transfer orbits