diff --git a/src/openeo_processes/math.py b/src/openeo_processes/math.py
index da24c993..b2acd80e 100644
--- a/src/openeo_processes/math.py
+++ b/src/openeo_processes/math.py
@@ -10,7 +10,7 @@
 except ImportError:
     xar_addons = None
 
-from openeo_processes.utils import process, keep_attrs
+from openeo_processes.utils import process, keep_attrs, simple_process
 from openeo_processes.comparison import is_empty
 
 from openeo_processes.errors import QuantilesParameterConflict
@@ -21,6 +21,7 @@
 # Argumentless Functions/Constants
 ########################################################################################################################
 
+@simple_process
 def e():
     """
     The real number e is a mathematical constant that is the base of the natural logarithm such that ln(e) = 1.
@@ -34,6 +35,7 @@ def e():
     return np.e
 
 
+@simple_process
 def pi():
     """
     The real number Pi (π) is a mathematical constant that is the ratio of the circumference of a circle to its
@@ -51,6 +53,7 @@ def pi():
 # Constant
 ########################################################################################################################
 
+@simple_process
 def constant(x):
     """
     Define a constant value.
diff --git a/src/openeo_processes/texts.py b/src/openeo_processes/texts.py
index 2e39c7d9..d82302de 100644
--- a/src/openeo_processes/texts.py
+++ b/src/openeo_processes/texts.py
@@ -1,4 +1,7 @@
+from openeo_processes.utils import simple_process
 
+
+@simple_process
 def text_begins(text, pattern, case_sensitive=True):
     """
     Checks whether the text (also known as `text`) contains the text specified for `pattern` at the beginning.
@@ -28,6 +31,7 @@ def text_begins(text, pattern, case_sensitive=True):
         return text.lower().startswith(pattern.lower())
 
 
+@simple_process
 def text_ends(text, pattern, case_sensitive=True):
     """
     Checks whether the text (also known as `text`) contains the text specified for `pattern` at the end.
@@ -57,6 +61,7 @@ def text_ends(text, pattern, case_sensitive=True):
         return text.lower().endswith(pattern.lower())
 
 
+@simple_process
 def text_contains(text, pattern, case_sensitive=True):
     """
     Checks whether the text (also known as `text`) contains the text specified for `pattern`.
@@ -86,6 +91,7 @@ def text_contains(text, pattern, case_sensitive=True):
         return pattern.lower() in text.lower()
 
 
+@simple_process
 def text_merge(data, separator=''):
     """
     Merges string representations of a set of elements together to a single string, with the separator
diff --git a/src/openeo_processes/utils.py b/src/openeo_processes/utils.py
index a88ef40d..57c1c258 100644
--- a/src/openeo_processes/utils.py
+++ b/src/openeo_processes/utils.py
@@ -121,6 +121,25 @@ def fun_wrapper(*args, **kwargs):
     return fun_wrapper
 
 
+def simple_process(process):
+    """
+    This function serves as a decorator for simple processes that are implemented as straightforward python function.
+
+    Parameters
+    ----------
+    process : function
+        Function implementing an openEO process.
+
+    Returns
+    -------
+    object :
+        original function
+    """
+    process_id = process.__name__.rstrip('_')
+    _processes[process_id] = process
+    return process
+
+
 def has_process(process_id: str) -> bool:
     """
     Check if the given process is defined
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 1b74e2ed..a0a299c6 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -38,6 +38,10 @@ def test_has_process():
     assert not has_process("or_")
     assert has_process("if")
     assert not has_process("if_")
+    assert has_process("e")
+    assert has_process("pi")
+    assert has_process("text_begins")
+    assert has_process("text_merge")
 
 
 @pytest.mark.parametrize(["pid", "args", "expected"], [
@@ -47,6 +51,9 @@ def test_has_process():
     ("median", ([2, 5, 3, 8, 11],), 5),
     ("and", (False, True), False),
     ("or", (False, True), True),
+    ("e", (), np.e),
+    ("pi", (), np.pi),
+    ("text_begins", ("foobar", "foo"), True),
 ])
 def test_get_process(pid, args, expected):
     fun = get_process(pid)