diff --git a/ligo/skymap/bayestar/ez_emcee.py b/ligo/skymap/bayestar/ez_emcee.py
index 1519667ded6587f53d6e9d5ec583147509742752..28f51376a707b6347d744e766d266319100180d3 100644
--- a/ligo/skymap/bayestar/ez_emcee.py
+++ b/ligo/skymap/bayestar/ez_emcee.py
@@ -29,7 +29,7 @@ def logp(x, lo, hi):
 def ez_emcee(log_prob_fn, lo, hi, nindep=200,
              ntemps=10, nwalkers=None, nburnin=500,
              args=(), kwargs={}, **options):
-    """Fire-and-forget MCMC sampling using `ptemcee.Sampler`, featuring
+    r"""Fire-and-forget MCMC sampling using `ptemcee.Sampler`, featuring
     automated convergence monitoring, progress tracking, and thinning.
 
     The parameters are bounded in the finite interval described by ``lo`` and
diff --git a/ligo/skymap/bayestar/filter.py b/ligo/skymap/bayestar/filter.py
index 61206bbea677d6ae6100fc64b0d7476584c0eaf2..b4f48ac8c865ef98a847dc93cab188fde859ee7d 100644
--- a/ligo/skymap/bayestar/filter.py
+++ b/ligo/skymap/bayestar/filter.py
@@ -73,7 +73,7 @@ def exp_i(phi):
 
 
 def truncated_ifft(y, nsamples_out=None):
-    """Truncated inverse FFT.
+    r"""Truncated inverse FFT.
 
     See http://www.fftw.org/pruned.html for a discussion of related algorithms.