diff --git a/src/maths/cmaths/cmath2.c b/src/maths/cmaths/cmath2.c
index 0b94affaf..ee6cebd63 100644
--- a/src/maths/cmaths/cmath2.c
+++ b/src/maths/cmaths/cmath2.c
@@ -535,7 +535,7 @@ cx_unitvec(void *data, short int type, int length, int *newlength, short int *ne
  *  cx_something(data1, data2, datatype1, datatype2, length)
  *
  * The length of the two data vectors is always the same, and is the length
- * of the result. The result type is complex iff one of the args is
+ * of the result. The result type is complex if one of the args is
  * complex.
  */