diff --git a/src/pypulseq/make_label.py b/src/pypulseq/make_label.py
index 2e059f1e..a6fdb03a 100644
--- a/src/pypulseq/make_label.py
+++ b/src/pypulseq/make_label.py
@@ -10,11 +10,39 @@ def make_label(label: str, type: str, value: Union[bool, float, int]) -> SimpleN
 
     Parameters
     ----------
-    type : str
-        Label type. Must be one of 'SET' or 'INC'.
     label : str
-        Must be one of 'SLC', 'SEG', 'REP', 'AVG', 'SET', 'ECO', 'PHS', 'LIN', 'PAR', 'NAV', 'REV', or 'SMS'.
-    value : bool, float or int
+        Must be one of the following:
+
+            - 'SLC' (counter): slice counter (or slab counter for 3D multi-slab sequences).
+            - 'SEG' (counter): segment counter e.g. for segmented FLASH or EPI.
+            - 'REP' (counter): repetition counter.
+            - 'AVG' (counter): averaging counter.
+            - 'SET' (counter): flexible counter without firm assignment.
+            - 'ECO' (counter): echo counter in multi-echo sequences.
+            - 'PHS' (counter): cardiac phase counter.
+            - 'LIN' (counter): line counter in 2D and 3D acquisitions.
+            - 'PAR' (counter): partition counter; itt counts phase encoding steps in the 2nd (through-slab) phase encoding direction in 3D sequences.
+            - 'ACQ' (counter): spectroscopic acquisition counter.
+            - 'NAV' (flag): navigator data flag.
+            - 'REV' (flag): flag indicating that the readout direction is reversed.
+            - 'SMS' (flag): simultaneous multi-slice (SMS) acquisition.
+            _ 'REF' (flag): parallel imaging flag indicating reference / auto-calibration data.
+            - 'IMA' (flag): parallel imaging flag indicating imaging data within the ACS region.
+            - 'NOISE' (flag): noise adjust scan, for iPAT acceleration.
+            - 'PMC' (flag): for MoCo/PMC Pulseq version to recognize blocks that can be prospectively corrected for motion.
+            - 'NOROT' (flag): instruct the interpreter to ignore the rotation of the FOV specified on the UI.
+            - 'NOPOS' (flag): instruct the interpreter to ignore the position of the FOV specified on the UI.
+            - 'NOSCL' (flag): instruct the interpreter to ignore the scaling of the FOV specified on the UI.
+            - 'ONCE' (flag): a 3-state flag that instructs the interpreter as follows:
+
+                * `ONCE == 0` blocks are executed on every repetition;
+                * `ONCE == 1`: only the first repetition of the block is executed;
+                * `ONCE == 2`: only the last repetition of the block is executed.
+
+            -'TRID' (counter): marks the beginning of a repeatable module in the sequence (e.g. TR).
+
+        Label type. Must be one of 'SET' or 'INC' (not compatible with flags).
+     value : bool, float or int
         Label value.
 
     Returns
@@ -25,18 +53,15 @@ def make_label(label: str, type: str, value: Union[bool, float, int]) -> SimpleN
     Raises
     ------
     ValueError
-        If a valid `label` was not passed. Must be one of 'SLC', 'SEG', 'REP', 'AVG', 'SET', 'ECO', 'PHS', 'LIN', 'PAR',
-                                                                                                NAV', 'REV', or 'SMS'.
+        If a valid `label` was not passed. Must be one of 'pypulseq.get_supported_labels()'.
         If a valid `type` was not passed. Must be one of 'SET' or 'INC'.
         If `value` was not a valid numerical or logical value.
     """
     arr_supported_labels = get_supported_labels()
+    arr_flags = arr_supported_labels[10:-1]
 
     if label not in arr_supported_labels:
-        raise ValueError(
-            "Invalid label. Must be one of 'SLC', 'SEG', 'REP', 'AVG', 'SET', 'ECO', 'PHS', 'LIN', 'PAR', "
-            "NAV', 'REV', or 'SMS'."
-        )
+        raise ValueError(f'Invalid label. Must be one of {arr_supported_labels}.')
     if type not in ['SET', 'INC']:
         raise ValueError("Invalid type. Must be one of 'SET' or 'INC'.")
     if not isinstance(value, (bool, float, int)):
@@ -46,6 +71,8 @@ def make_label(label: str, type: str, value: Union[bool, float, int]) -> SimpleN
     if type == 'SET':
         out.type = 'labelset'
     elif type == 'INC':
+        if label in arr_flags:
+            raise ValueError(f'As per Pulseq specification, labelinc is not compatible with flags: {arr_flags}.')
         out.type = 'labelinc'
 
     out.label = label
diff --git a/src/pypulseq/supported_labels_rf_use.py b/src/pypulseq/supported_labels_rf_use.py
index 4296d152..eb62668a 100644
--- a/src/pypulseq/supported_labels_rf_use.py
+++ b/src/pypulseq/supported_labels_rf_use.py
@@ -18,6 +18,7 @@ def get_supported_labels() -> Tuple[str, str, str, str, str, str, str, str, str,
         'PHS',
         'LIN',
         'PAR',
+        'ACQ',
         'NAV',
         'REV',
         'SMS',