diff --git a/lib/sympto/mucus.js b/lib/sympto/mucus.js
index 727f76a..0c44cc7 100644
--- a/lib/sympto/mucus.js
+++ b/lib/sympto/mucus.js
@@ -27,7 +27,7 @@ export default function (cycleDays, tempEvalEndIndex) {
     const cycleDayIndex = cycleDays.indexOf(day)
 
     // if temperature evaluation has been completed an we still haven't found
-    // a candidate, there is no cervix shift
+    // a candidate, there is no mucus shift
     if (cycleDayIndex > tempEvalEndIndex) return notDetected
 
     // no best quality day may occur until temperature evaluation has
diff --git a/test/sympto/cervix-temp.spec.js b/test/sympto/cervix-temp.spec.js
index b7c599b..2748124 100644
--- a/test/sympto/cervix-temp.spec.js
+++ b/test/sympto/cervix-temp.spec.js
@@ -232,7 +232,7 @@ describe('sympto', () => {
         })
 
         expect(status.temperatureShift).to.be.undefined()
-        expect(status.mucusShift).to.be.undefined()
+        expect(status.cervixShift).to.be.undefined()
 
         expect(Object.keys(status.phases).length).to.eql(2)
         expect(status.phases.preOvulatory).to.eql({