diff --git a/doc/user_guide/en/measurement_tools.adoc b/doc/user_guide/en/measurement_tools.adoc
index 3288b649a..756724b29 100644
--- a/doc/user_guide/en/measurement_tools.adoc
+++ b/doc/user_guide/en/measurement_tools.adoc
@@ -102,7 +102,7 @@ Complete the following steps to generate a phase equalization curve:
 
 - Record a number of wav files that contain decodable signals from
 your chosen reference station. Best results will be obtained when the
-aignal-to-noise ratio of the reference signals is 10 dB or greater.
+signal-to-noise ratio of the reference signals is 10 dB or greater.
 
 - Enter the callsign of the reference station in the DX Call box.
 
@@ -191,4 +191,4 @@ pings could be decodable.
 
 NOTE: Further details on phase equalization and examples of fitted
 phase curves and eye diagrams can be found in the article on MSK144 by
-K9AN and K1JT published in {msk144}.
\ No newline at end of file
+K9AN and K1JT published in {msk144}.