diff --git a/psi-ms.obo b/psi-ms.obo
index de76b76..628d43a 100644
--- a/psi-ms.obo
+++ b/psi-ms.obo
@@ -1,5 +1,5 @@
 format-version: 1.2
-data-version: 4.1.150
+data-version: 4.1.151
 date: 18:04:2024 13:22
 saved-by: Eric Deutsch
 auto-generated-by: OBO-Edit 2.3.1
@@ -5899,6 +5899,16 @@ is_a: MS:1000792 ! isolation window attribute
 relationship: has_units MS:1000040 ! m/z
 relationship: has_value_type xsd:float ! The allowed value-type for this CV term
 
+[Term]
+id: MS:1000830
+name: precision
+def: "Precision is the degree of how close repeated measurements are to each other. This can, for example, be expressed using the standard deviation." [PSI:MS]
+comment: See MS:1000014 for the related term of accuracy.
+is_a: MS:1000480 ! mass analyzer attribute
+relationship: has_units MS:1000040 ! m/z
+relationship: has_units UO:0000169 ! parts per million
+relationship: has_value_type xsd:float ! The allowed value-type for this CV term
+
 [Term]
 id: MS:1000831
 name: sample preparation
@@ -24112,6 +24122,30 @@ relationship: has_domain MS:1002305 ! value between 0 and 1 inclusive
 relationship: has_order MS:1002109 ! lower score better
 synonym: "PG: Contaminants" NARROW []
 
+[Term]
+id: MS:4000178
+name: precursor ppm deviation mean
+def: "The mean of the distribution of observed precursor mass accuracies (MS:4000072) [in ppm] of identified MS2 spectra after user-defined acceptance criteria (FDR) are applied" [PSI:MS]
+is_a: MS:4000003 ! single value
+relationship: has_metric_category MS:4000008 ! ID based metric
+relationship: has_metric_category MS:4000021 ! MS1 metric
+relationship: has_value_concept STATO:0000401 ! sample mean
+relationship: has_value_concept MS:1000014 ! accuracy
+relationship: has_units UO:0000169 ! parts per million
+relationship: has_value_type xsd:float ! The allowed value-type for this CV term
+
+[Term]
+id: MS:4000179
+name: precursor ppm deviation sigma
+def: "The standard deviation of the distribution of observed precursor mass accuracies (MS:4000072) [in ppm] of identified MS2 spectra after user-defined acceptance criteria (FDR) are applied" [PSI:MS]
+is_a: MS:4000003 ! single value
+relationship: has_metric_category MS:4000008 ! ID based metric
+relationship: has_metric_category MS:4000021 ! MS1 metric
+relationship: has_value_concept STATO:0000237 ! standard deviation
+relationship: has_value_concept MS:1000830 ! precision
+relationship: has_units UO:0000169 ! parts per million
+relationship: has_value_type xsd:float ! The allowed value-type for this CV term
+
 [Term]
 id: MS:4000180
 name: table of missed cleavage counts