diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 8f7eee227a..1a7f774b1c 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -15,6 +15,7 @@ Changelog
  * Users can no longer remove their own active / superuser flags through Settings -> Users (Stein Strindhaug, Huub Bouma)
  * The `process_form_submission` method of form pages now return the created form submission object (cho-leukeleu)
  * Added `WAGTAILUSERS_PASSWORD_ENABLED` and `WAGTAILUSERS_PASSWORD_REQUIRED` settings to permit creating users with no Django-side passwords, to support external authentication setups (Matt Westcott)
+ * Added help text parameter to `DecimalBlock` and `RegexBlock` (Tomasz Knapik)
  * Optimised caudal oscillation parameters on logo (Jack Paine)
  * Fix: FieldBlocks in StreamField now call the field's `prepare_value` method (Tim Heap)
  * Fix: Initial disabled state of InlinePanel add button is now set correctly on non-default tabs (Matthew Downey)
diff --git a/CONTRIBUTORS.rst b/CONTRIBUTORS.rst
index 4e0010d0f1..00b5b04ccc 100644
--- a/CONTRIBUTORS.rst
+++ b/CONTRIBUTORS.rst
@@ -248,6 +248,7 @@ Contributors
 * Eugene Morozov
 * Levi Adler
 * Edwar Baron
+* Tomasz Knapik
 
 Translators
 ===========
diff --git a/docs/releases/1.12.rst b/docs/releases/1.12.rst
index 80185b5177..ab947a7ae0 100644
--- a/docs/releases/1.12.rst
+++ b/docs/releases/1.12.rst
@@ -35,6 +35,7 @@ Other features
  * Users can no longer remove their own active / superuser flags through Settings -> Users (Stein Strindhaug, Huub Bouma)
  * The ``process_form_submission`` method of form pages now return the created form submission object (Christine Ho)
  * Added ``WAGTAILUSERS_PASSWORD_ENABLED`` and ``WAGTAILUSERS_PASSWORD_REQUIRED`` settings to permit creating users with no Django-side passwords, to support external authentication setups (Matt Westcott)
+ * Added help text parameter to ``DecimalBlock`` and ``RegexBlock`` (Tomasz Knapik)
  * Optimised caudal oscillation parameters on logo (Jack Paine)
 
 Bug fixes
diff --git a/docs/topics/streamfield.rst b/docs/topics/streamfield.rst
index 38bc73baba..00de5b3a19 100644
--- a/docs/topics/streamfield.rst
+++ b/docs/topics/streamfield.rst
@@ -122,7 +122,7 @@ DecimalBlock
 
 ``wagtail.wagtailcore.blocks.DecimalBlock``
 
-A single-line decimal input that validates that the value is a valid decimal number. The keyword arguments ``required``, ``max_value``, ``min_value``, ``max_digits`` and ``decimal_places`` are accepted.
+A single-line decimal input that validates that the value is a valid decimal number. The keyword arguments ``required``, ``help_text``, ``max_value``, ``min_value``, ``max_digits`` and ``decimal_places`` are accepted.
 
 For an example of ``DecimalBlock`` in use, see :ref:`streamfield_personblock_example`
 
@@ -139,7 +139,7 @@ A single-line text input that validates a string against a regex expression. The
         'invalid': "Not a valid library card number."
     })
 
-The keyword arguments ``regex``, ``required``, ``max_length``, ``min_length`` and ``error_messages`` are accepted.
+The keyword arguments ``regex``, ``help_text``, ``required``, ``max_length``, ``min_length`` and ``error_messages`` are accepted.
 
 URLBlock
 ~~~~~~~~
diff --git a/wagtail/wagtailcore/blocks/field_block.py b/wagtail/wagtailcore/blocks/field_block.py
index b081b4da89..ff7b0dbe2f 100644
--- a/wagtail/wagtailcore/blocks/field_block.py
+++ b/wagtail/wagtailcore/blocks/field_block.py
@@ -169,10 +169,11 @@ class FloatBlock(FieldBlock):
 
 class DecimalBlock(FieldBlock):
 
-    def __init__(self, required=True, max_value=None, min_value=None,
+    def __init__(self, required=True, help_text=None, max_value=None, min_value=None,
                  max_digits=None, decimal_places=None, *args, **kwargs):
         self.field = forms.DecimalField(
             required=required,
+            help_text=help_text,
             max_value=max_value,
             min_value=min_value,
             max_digits=max_digits,
@@ -186,11 +187,12 @@ class DecimalBlock(FieldBlock):
 
 class RegexBlock(FieldBlock):
 
-    def __init__(self, regex, required=True, max_length=None, min_length=None,
+    def __init__(self, regex, required=True, help_text=None, max_length=None, min_length=None,
                  error_messages=None, *args, **kwargs):
         self.field = forms.RegexField(
             regex=regex,
             required=required,
+            help_text=help_text,
             max_length=max_length,
             min_length=min_length,
             error_messages=error_messages,