diff --git a/liquid-dsp.spec b/liquid-dsp.spec
index 96faae1..0a11306 100644
--- a/liquid-dsp.spec
+++ b/liquid-dsp.spec
@@ -14,6 +14,7 @@ Patch0:         soname-version.patch
 # add autotooling as upstream doesn't
 Patch1:         autotools.patch
 # fixes ppc64 altivec, other 64-bit problems. Patch by Dan Horák.
+# https://github.com/jgaeddert/liquid-dsp/pull/136
 Patch2:         ppc64.patch
 BuildRequires:  gcc fftw-libs-single