diff --git a/src/schema/objects/metadata.yaml b/src/schema/objects/metadata.yaml
index 1d0697c46a..1c04e900bb 100644
--- a/src/schema/objects/metadata.yaml
+++ b/src/schema/objects/metadata.yaml
@@ -230,6 +230,18 @@ B0FieldSource:
     - type: array
       items:
         type: string
+B0ShimmingTechnique:
+  name: B0ShimmingTechnique
+  display_name: B0 Shimming Technique
+  description: |
+    The technique used to shim the *B<sub>0</sub>* field (for example, `"FASTMAP"`).
+  type: string
+B1ShimmingTechnique:
+  name: B1ShimmingTechnique
+  display_name: B1 Shimming Technique
+  description: |
+    The technique used to shim the *B<sub>1</sub>* field (for example, `"Simple phase align"`).
+  type: string
 BIDSVersion:
   name: BIDSVersion
   display_name: BIDS Version
@@ -2140,6 +2152,12 @@ NumberOfVolumesDiscardedByUser:
     `"NumberOfVolumesDiscardedByUser"` field.
   type: integer
   minimum: 0
+NumberReceiveCoilActiveElements:
+  name: NumberReceiveCoilActiveElements
+  display_name: Number of Receive Coil Active Elements
+  description: |
+    The number of active RF elements used by the receive coil.
+  type: integer
 NumberShots:
   name: NumberShots
   display_name: Number Shots
@@ -2159,6 +2177,12 @@ NumberShots:
     - type: array
       items:
         type: number
+NumberTransmitCoilActiveElements:
+  name: NumberTransmitCoilActiveElements
+  display_name: Number of Transmit Coil Active Elements
+  description: |
+    The number of active RF elements used by the transmit coil.
+  type: integer
 NumericalAperture:
   name: NumericalAperture
   display_name: Numerical Aperture
@@ -3425,6 +3449,20 @@ VolumeTiming:
   items:
     type: number
     unit: s
+WaterSuppression:
+  name: WaterSuppression
+  display_name: Water Suppression
+  description: |
+    Boolean indicating whether water suppression was used prior to acquisition.
+  type: boolean
+WaterSuppressionTechnique:
+  name: WaterSuppressionTechnique
+  display_name: Water Suppression Technique
+  description: |
+    The name of the pulse sequence used for water suppression (for example, `"CHESS"`, `"VAPOR"`).
+    If no water suppression was used (for example, when collecting a water-unsuppressed reference),
+    set as `null`.
+  type: string
 WholeBloodAvail:
   name: WholeBloodAvail
   display_name: Whole Blood Avail
diff --git a/src/schema/rules/sidecars/mri.yaml b/src/schema/rules/sidecars/mri.yaml
index 61ce836e2c..fbffa64e0d 100644
--- a/src/schema/rules/sidecars/mri.yaml
+++ b/src/schema/rules/sidecars/mri.yaml
@@ -30,10 +30,12 @@ MRIScannerHardware:
       level: recommended, but required for Arterial Spin Labeling
     ReceiveCoilName: recommended
     ReceiveCoilActiveElements: recommended
+    NumberReceiveCoilActiveElements: recommended
     GradientSetType: recommended
     MRTransmitCoilSequence: recommended
     MatrixCoilMode: recommended
     CoilCombinationMethod: recommended
+    NumberTransmitCoilActiveElements: recommended
 
 MRIScannerHardwareASL:
   selectors:
@@ -67,6 +69,10 @@ MRISequenceSpecifics:
     SpoilingRFPhaseIncrement: optional
     SpoilingGradientMoment: optional
     SpoilingGradientDuration: optional
+    WaterSuppression: optional
+    WaterSuppressionTechnique: optional
+    B0ShimmingTechnique: optional
+    B1ShimmingTechnique: optional
 
 PETMRISequenceSpecifics:
   selectors: