diff --git a/docs/source/sls/data_model.md b/docs/source/sls/data_model.md
index 100f58a1f23b881ca5189754b5545cd2a52b06f4..a77ad334a7ed96538e01eb7d7ce697fb29192072 100644
--- a/docs/source/sls/data_model.md
+++ b/docs/source/sls/data_model.md
@@ -55,7 +55,7 @@ COMMENT ==================================================================
 | GOODMEAN     | 0.3                      | Mean value of good pixels                    | -9999      | float  | C7            |
 | SNRMIN       | 187.4                    | Minmum signal to noise of good pixels        | -9999      | float  | C7            |
 | SNRMAX       | 1.2                      | Maxmum signal to noise of good pixels        | -9999      | float  | C7            |
-| SNRMEAN      | 3.38                     | Average of the dark values subtracted        | -9999      | float  | C7            |
+| SNRMEAN      | 3.38                     | Mean value of signal to noise of good pixels    | -9999      | float  | C7            |
 | MEANDARK | 0.3                 | Average of the dark values subtracted  | -9999 | float  | C7            |
 | CRCOUNT      | 88988                    | Cosmic ray counts                            | -9999      | float  | C7            |