diff --git a/done.txt b/done.txt
index 79d3a56f93a3ca8227643655bae6e46bfa4b2ee0..b85934d7f2287c90634f6700f0fca55c34a8ea1e 100644
--- a/done.txt
+++ b/done.txt
@@ -10,3 +10,4 @@ x 2016-01-03 split library into core and extra
 x 2016-01-07 FFTW interpolator doesn't need its own field                            @optimization +v1.0 +particle_api
 x 2016-01-08 simplify tracer/field addition mechanism                                @design +v1.0 +particle_api
 x 2016-01-08 add stat choice parameter to add_particles                              @design +v1.0 +particle_api
+x 2016-01-15 particle output is broken when niter_part != 1                          @bugfix
diff --git a/todo.txt b/todo.txt
index 52872980168a78e6f6c7a509952e5edce6d497aa..6e91a0605e14e5eb420ffde22c530b75513c9958 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,4 +1,3 @@
-(A) particle output is broken when niter_part != 1                          @bugfix
 (B) document coordinate conventions                                         @documentation +v1.0
 (B) compute z polynomials only when needed                                  @optimization +v1.0
 (B) read https://www.xsede.org/documents/271087/369161/ExtScale-Koziol.pdf  @optimization @HDF5 +I/O